Question

A ball with a mass of `7 kg` moving at `4 m/s` hits a still ball with a mass of `9 kg`. If the first ball stops moving, how fast is the second ball moving?

Answer 1

`=3.1 dot 1 m/s` in the direction of motion of the first ball.

Explanation:

See A ball with a mass of `8 kg` moving at `7 m/s` hits a still ball with a mass of `12 kg`. If the...