Angled LaunchPlace homework on my desk

A quarterback throws a football at an angle 20º to the horizontal. The ball lands 30 meters downfield 1.5s after it was thrown.

A) What is the horizontal component of its velocity?

B) What was the initial launch speed of the football?

A quarterback throws a football at an angle 20º to the horizontal. The ball lands 30 meters downfield 1.5s after it was thrown.

A) What is the horizontal component of its velocity?

A quarterback throws a football at an angle 20º to the horizontal. The ball lands 30 meters downfield 1.5s after it was thrown.

B) What was the initial launch speed of the football?

Announcement

• HW2 is now live - Due on Thursday at 11am

• Solutions are available on Quest for HW1

Angled LaunchConceptual

Popular Angles

• 45º = Max Range (depends on ttotal, Vo,x, Vo,y)

• 90º = Max height (depends on Vo,y)

• 90º = Max time of flight (ttotal depends on height)

Symmetry around 45º

Practice

There is symmetry about 45º.

Starting from 0º, the angle increase results in a height increase and continues to do so until 45º.

Then, the angle increase will result in a decrease of range after reaching 45º, but this

decrease acts proportionally to the original increase in angle.