A cart of mass M1 = 4.00 kg and initial speed = 4.00 m/s collides head on with a second cart of mass M2 = 2.00 kg at rest. Assuming that the collision is elastic, find the speed of M2 after the collision.

i keep getting the wrong answer
please help me.I don't know what equation to use.

7 answers

4m/s

how did you do it?

its wrong

You have to use two equations: Conservation of momentum, and conservation of energy.

I will be happy to critique your work.

it be easier to explain if i had my book, the answer may not be a 100% rgt because my calc is in my car, why u post this? need help with homework?

sorry lol

okay thanks bobpursley
ill work on it today and post my solution later
=]