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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