# A ball with a mass of #7 kg# moving at #1 m/s# hits a still ball with a mass of #10 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

Nov 2, 2016

By momentum conservation ,

*Let the velocity of ball with mass 10 kg be 'v'.*

Loss in kinetic energy = KE_i - KE_f#

Loss in kinetic energy =

Loss in kinetic energy =

Loss in kinetic energy =