# Homework Help: Collision help

1. Nov 20, 2013

### colmes

1. The problem statement, all variables and given/known data
(Diagram of problem is given in attachment)
m2 is stationary
The coefficient of kinetic friction on m2 is 0.2 while the ground below m2 has a coefficient of friction of 0.

a) Find the final velocity of both objects if m1 moves at the same v as m2

b)Find the minimum length of m2

2. Relevant equations

mv = p (Momentum)

3. The attempt at a solution

m1v1 = m1v1' + m2v1'
m1v1 = 50v1'
(10)(20) = 50v1'
200/50 = v1'
v1 = 4m/s

I was able to calculate the final velocity of the two objects using conservation of momentum but I have no clue how to calculate the minimum length of m2.

#### Attached Files:

• ###### Physics problem 1.docx
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Last edited: Nov 20, 2013
2. Nov 21, 2013

### Basic_Physics

m1 is slowed down from 10 to 4 meters per second on m2 while m2 is speeding up from 0 to 4 m/s. At that point they are moving together.

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