Question

A ball with a mass of `2 kg` moving at `3 m/s` hits a still ball with a mass of `4 kg`. If the first ball stops moving, how fast is the second ball moving?

Answer 1

`v=6/4=1,5 m/s`

Explanation:

`"use conversation of momentum"`
`"total momentum of before collision=total momentum of after momentum"`
`2*3+0=0+4*v`
`6=4*v`
`v=6/4=1,5 m/s`