Sun November 11, 2012 By:

A clay ball of mass m and speed v strikes another metal ball of the same mass m, which is at rest. They stick together after collision. The kinetic energy of the system after collision is what?

Expert Reply
Mon November 12, 2012
By conservation of linear momentum,
momentum before collision =momentum after collision
                                     mv = 2m v’
                                  v’ =v/2
 Final kinetic energy,         KEf =(1/2)x(2m)x (v’)2 =(mv2) /4

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