# A ball with a mass of #3 kg# moving at #8 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?

##### 1 Answer

Jul 31, 2018

#### Answer:

The speed of the second ball is

#### Explanation:

There is conservation of momentum

The mass

The velocity

The mass

The velocity

The velocity

Therefore,