Question

A ball with a mass of `7 kg` moving at `6 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

`4.67 m/s`

Explanation:

Use conservation of momentum relation

`Momentum =Mass *Velocity`
`7*6 = 9*velocity_(ball2)`
`velocity_(ball2)= (7*6)/9 = 4.67 m/s`