A-Level momentum question

RachelT

first post so here goes: this question isn't hard but i can't seem to get the answer i should have.

'a car of mass 1050kg runs into the back of car b which is stationary with mass 1200kg. car A was moving at 50mph immediately before impact. after impact, the vehicles are locked together'

calculate the speed at which the 2 vehicles move immediately after collision and the amount of kinetic energy lost in the collision. what has happened to this energy?

any help appreciated. thank you!

CWatters

Welcome to the forum. You are meant to show your attempt at a solution and any equations/assumptions used before asking for help.

Simon Bridge

Duplicate:
http://www.physicsforums.com/showthread.php?t=627246
... there's more discussion there.