Question

A 10g object moving to the right at 20cm/s makes an elastic head-on collision with a 15g object moving in the opposite at 30cm/s. Find the velocity of each object after the collision.

answer: -40cm/s, 10cm/s
Assume both total momentum and total kinetic energy are conserved, and that the recoil velocities are along the same axis.

I will be glad to critique your work.
Object A of mass 20kg moving with velocity of 3m/s makes a head collition wth an object B of mass 10kg moving wth a velocity of 2m/s in opposite directinn. If a&b stick together after collision,caculate their common velocity v in the direction of A

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