posted by Tammy .
A 5kg object moves to the right with a speed of 2m/s. It collides in a perfectly elastic collision with a 2 kg object moving to the left at 5m/s.What is the total kinetic energy after the collision?
In elastic collisions KE is conserved so KE_i =KE_f
Is this correct?
The toal Ke is the same as it started with, that is the definition of an elastaic equation.
Yes, you have it.