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JAMB Physics 2020 Paper

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Question : 3

Total: 38

A machine gun with a mass of 5kg fires a 50g bullet at a speed of 100 ms

^{-1}

. The recoil speed of the machine gun is

0.5 ms $^{-1}$
1.5 ms $^{-1}$
1 ms $^{-1}$
2ms $^-1$

Solution:

Gun Momentum = bullet momentum

M $_a$ V $_a$ = M $_b$ V $_b$

5 x V $_a$ = 0.05 x 100

V $_a$ = 1m $^{-1}$

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