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?
In the first scenario, momentum conservation law will be applied.
from the law,
we have to find
if we put all the values in the equation, we will find,
for the energy loss,