# A ball with a mass of #2 kg# moving at #16 m/s# hits a still ball with a mass of #21 kg#. If the first ball stops moving, how fast is the second ball moving? How much kinetic energy was lost as heat in the collision?

##### 1 Answer

Oct 28, 2016

In the first scenario, momentum conservation law will be applied.

#### Explanation:

from the law,

here,

we have to find

if we put all the values in the equation, we will find,

for the energy loss,

so,