Inelastic Collision Problem. Help

[blue_bee29]

Homework Statement

A cart of mass 1.2 kg that is moving to the right qt 3m/s collides on a block of wood of mass 0.8 kg that is lying at rest on top of a frictionless table. if the collision is inelastic, find the velocity of the composite body.

Homework Equations

The Attempt at a Solution

 

[captain.joco]

Well..

you know that the collision is inelastic, so kinetic energy will not be conserved, but momentum will be. You know the masses and the velocities before the collision as well as their velocities, and you can safely assume that mass is conserved, you can use momentum conservation to find the velocity of the composite body.