What is the Coefficient of Restitution in a Block Collision with a Wall?

[SuperGeek]

Hi all,
I am trying to find the coefficient of restitution in this example:
Block m1=2 kg is pushed with initial velocity v=7 m/s for distance
d = 4 meters towards a wall. Kinetic friction b/w floor and block is mK = 0.4. The block rebounds off the wall and travels distance
d2 = 1 m before stopping.

I think I should get the speeds of the block right before and after hitting the wall first but I am really lost on this one. Any help or teaching would be appreciated.

 

[himanshu121]

First of calculate the relative velocity of approach and separation

e= coefficient of restitutio is given by relative velocity of separation along the normal divided by relative velocity of approach

 

[Doc Al]

Note to SuperGeek: You posted this in the Classical Physics section, check there for my response.

PS: Bad Dog for posting twice!