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## Homework Statement

Problem 1: The coefficient of restitution for steel colliding with steel is 0.95. If steel is dropped from a height ho above steel plate, to what height will the ball rebound.

Problem 2: in an elastic head on collision with a stationary target particle, a moving particle recoils of its incident speed. What is the ration of the particles masses (m/M)

## Homework Equations

1. v2-v1=-e(v2o-v1o)

v=sqrt(2gh)

2. mv= mv + MV

## The Attempt at a Solution

1. -e= (v2-v1)/(v2o-v1o)

-.95=(v2-v1)/(v2o-v1o)

From there I honestly have no clue what to do.

2. mv = m(-1/3V) +MV

4/3mv = MV

The book answer is 1/2, and I'm working with thirds? Should I be using a KE equation?

Any help is appreciated.