speed calculations. a cross-country runner runs 10 km in 40 minutes. what is his average speed?...
TRANSCRIPT
Speed Calculations
Speed Calculations
• A cross-country runner runs 10 km in 40 minutes. What is his average speed?
Given FGiven Formula Work Answer
Speed Calculations
• A cross-country runner runs 10 km in 40 minutes. What is his average speed?
Given FGiven Formula Work Answer
Look for what is given.
Speed Calculations
• A cross-country runner runs 10 km in 40 minutes. What is his average speed?
Given FGiven Formula Work Answer
d = 10 km
Speed Calculations
• A cross-country runner runs 10 km in 40 minutes. What is his average speed?
Given FGiven Formula Work Answer
d = 10 km t = 40 min
Speed Calculations
• A cross-country runner runs 10 km in 40 minutes. What is his average speed?
Given FGiven Formula Work Answer
d = 10 km t = 40 min
What does the problem ask for?
Speed Calculations
• A cross-country runner runs 10 km in 40 minutes. What is his average speed?
Given FGiven Formula Work Answer
d = 10 km t = 40 min
Speed Calculations
• A cross-country runner runs 10 km in 40 minutes. What is his average speed?
Given FGiven Formula Work Answer
d = 10 km t = 40 min
What formula will you use to find the answer?
Speed Calculations
• A cross-country runner runs 10 km in 40 minutes. What is his average speed?
Given FGiven Formula Work Answer
d = 10 km t = 40 min s = d/t
Speed Calculations
• A cross-country runner runs 10 km in 40 minutes. What is his average speed?
Given FGiven Formula Work Answer
d = 10 km t = 40 min s = d/t
Now, plug in the given values into the formula.
Speed Calculations
• A cross-country runner runs 10 km in 40 minutes. What is his average speed?
Given FGiven Formula Work Answer
d = 10 km t = 40 min s = d/t s = 10 km / 40 min.
Speed Calculations
• A cross-country runner runs 10 km in 40 minutes. What is his average speed?
Given FGiven Formula Work Answer
d = 10 km t = 40 min s = d/t s = 10 km / 40 min.
And solve!
Speed Calculations
• A cross-country runner runs 10 km in 40 minutes. What is his average speed?
Given FGiven Formula Work Answer
d = 10 km t = 40 min s = d/t s = 10 km / 40 min.
s = 0.25 km/min * 60 min. / hr =
Speed Calculations
• A cross-country runner runs 10 km in 40 minutes. What is his average speed?
Given FGiven Formula Work Answer
d = 10 km t = 40 min s = d/t s = 10 km / 40 min.
s = 0.25 km/min * 60 min. / hr =
Write the answer in the answer section.Do not forget the units!
Speed Calculations
• A cross-country runner runs 10 km in 40 minutes. What is his average speed?
Given FGiven Formula Work Answer
d = 10 km t = 40 min s = d/t s = 10 km / 40 min.
s = 0.25 km/min * 60 min. / hr =15 km/hr
Acceleration Calculations• Calculate the acceleration of an object that
changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs.
Given FGiven Formula Work Answer
Acceleration Calculations• Calculate the acceleration of an object that
changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs.
Given FGiven Formula Work Answer
Look for what is given.
Acceleration Calculations• Calculate the acceleration of an object that
changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs.
Given FGiven Formula Work Answer
vi=48 km/hr
Acceleration Calculations• Calculate the acceleration of an object that
changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs.
Given FGiven Formula Work Answer
vi=48 km/hrvf= 75 km/hr
Acceleration Calculations• Calculate the acceleration of an object that
changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs.
Given FGiven Formula Work Answer
vi=48 km/hrvf= 75 km/hrt = 27 hrs
Acceleration Calculations• Calculate the acceleration of an object that
changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs.
Given FGiven Formula Work Answer
vi=48 km/hrvf= 75 km/hrt = 27 hrs
What does the problem ask for?
Acceleration Calculations• Calculate the acceleration of an object that
changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs.
Given FGiven Formula Work Answer
vi=48 km/hrvf= 75 km/hrt = 27 hrs
Acceleration Calculations• Calculate the acceleration of an object that
changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs.
Given FGiven Formula Work Answer
vi=48 km/hrvf= 75 km/hrt = 27 hrs
What formula is required to find the answer?
Acceleration Calculations• Calculate the acceleration of an object that
changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs.
Given FGiven Formula Work Answer
vi=48 km/hrvf= 75 km/hrt = 27 hrs
a=(vf-vi)/t
Acceleration Calculations• Calculate the acceleration of an object that
changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs.
Given FGiven Formula Work Answer
vi=48 km/hrvf= 75 km/hrt = 27 hrs
a=(vf-vi)/t
Now, plug in the values and solve!
Acceleration Calculations• Calculate the acceleration of an object that
changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs.
Given FGiven Formula Work Answer
vi=48 km/hrvf= 75 km/hrt = 27 hrs
a=(vf-vi)/t a=(75 km/hr – 48 km/hr) / 27 hrs
Acceleration Calculations• Calculate the acceleration of an object that
changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs.
Given FGiven Formula Work Answer
vi=48 km/hrvf= 75 km/hrt = 27 hrs
a=(vf-vi)/t a=(75 km/hr – 48 km/hr) / 27 hrsa= 27km/hr / 27 hr = 1 km/hr2
Acceleration Calculations
• Calculate the acceleration of an object that changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs.Given FGiven Formula Work Answer
vi=48 km/hrvf= 75 km/hrt = 27 hrs
a=(vf-vi)/t a=(75 km/hr – 48 km/hr) / 27 hrsa= 27km/hr / 27 hr = 1 km/hr2
Write the answer in the answer section.Do not forget the units!
Acceleration Calculations
• Calculate the acceleration of an object that changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs.Given FGiven Formula Work Answer
vi=48 km/hrvf= 75 km/hrt = 27 hrs
a=(vf-vi)/t a=(75 km/hr – 48 km/hr) / 27 hrsa= 27km/hr / 27 hr = 1 km/hr2
a=1 km/hr2