JAMB - Physics (2020 - No. 3)
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\(^-1\)
Explanation
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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