- #1

MattDutra123

- 15

- 0

## Homework Statement

A ball of mass 0.075 is traveling horizontally with a speed of 2.20 m/s. It strikes a vertical wall and rebounds horizontally. Due to the collision with the wall, 20% of the ball's initial kinetic energy is dissipated.

Show that the ball rebounds from the wall with a speed of 1.97 m/s.

## Homework Equations

Impulse = F*t

Kinetic Energy = 1/2mv

^{2}

## The Attempt at a Solution

I attempted to use conservation of energy by having the initial kinetic energy (0.075*2.20

^{2}) be equal to 20% final kinetic energy (0.075*v

^{2}*1/5) This gave me a result of 2.2 m/s. I don't know how to reach the desired result of 1.97 m/s.

Apologies in advance for bad formatting.