- #1

- 2

- 0

## Homework Statement

A tennis ball of with a mass of .045 kg and speed of 25 m/sec strikes a wall at an angle of 45 degrees and rebounds with the same spped at 45 degrees. What is the impulse given the wall?

## Homework Equations

I= pf-pi/t

## The Attempt at a Solution

I= mv-mv/t

(.045)(25)-(-.045)(25)/1

1.125-1.125/1

I=2.25

I know the answer is 2.1, but don't know how to get it.