Posted by Joeline on Wednesday, May 22, 2013 at 10:06pm.
A hand gun fires a 12.0 g bullet at a speed of 400 m/s.
What is its kinetic energy?
At what speed must a motorcycle of mass 173 kg move to have the same kinetic energy as the bullet? Express your answer in km/h.

Physics !!!!! HELP PLEASE  drwls, Thursday, May 23, 2013 at 8:02am
K.E. is (1/2) M V^2
To get it in Joules, M must be in kg.
bullet KE = 960 Joules
If motorcycle KE = 960 J,and its mass is 173 kg,
(1/2)*173*Vm^2 = 960
then the motorcycle velocity is
Vm = 3.33 m/s
Convert that to km/h
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