# Inelastic collision problem

garr6120

## Homework Statement

I am doing this project and it asks me for the before and after velocity of a inelastic collision.

## The Attempt at a Solution

I have found the before velocity of both object which is 0 and 15 m/s, however i am trying to find the after velocities right now, the thing is they are not stuck together so their are two speeds. So far i have added my two momentum's to find the total momentum before collision. However, now i am stuck with a solution i cannot find.

Satvik Pandey
Have you been given the value of the coefficient of restitution?

Maged Saeed
I have found the before velocity of both object which is 0 and 15 m/s, however i am trying to find the after velocities right now, the thing is they are not stuck together so their are two speeds. So far i have added my two momentum's to find the total momentum before collision. However, now i am stuck with a solution i cannot find.

You have two equations , one for conservation of momentum and the other is for conservation of kinetic energy.
Because the kinetic energy is conserved in the elastic collision.
From them you can find the final velocities of the two objects.

Maged Saeed
By the way , it is an elastic collision , not inelastic.

Homework Helper
Gold Member
You have two equations , one for conservation of momentum and the other is for conservation of kinetic energy.

it is an elastic collision , not inelastic.
The OP says it is inelastic, so work is not conserved. It may be that garr6120 has stated the problem incorrectly, but I see no reason to suppose so.

Satvik Pandey
The OP says it is inelastic, so work is not conserved. It may be that garr6120 has stated the problem incorrectly, but I see no reason to suppose so.
Yeah! I too have doubt about that. But I think if the value of coefficient of restitution is given then that question can be solved even if the collision is inelastic.

Maged Saeed
The OP says it is inelastic, so work is not conserved. It may be that garr6120 has stated the problem incorrectly, but I see no reason to suppose so.

Oh ,, I thought that it is elastic since the two object doesn't stuck together ,,
I was wrong
:)