JAMB - Physics (1978 - No. 7)

A machine gun with a mass of 5kg fires a 50g bullet at speed of 100ms-1. The recoil speed of the machine gun is
0.5 msec-1
1.5 msec-1
1 msec-1
2 msec-1
4 msec-1

Explanation

Gun momentum = bullet momentum

5 x v = 0.05 x 100

v = 1 msec-1

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