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
A
0.5 ms\(^{-1}\)
B
1.5 ms\(^{-1}\)
C
1 ms\(^{-1}\)
D
2ms\(^-1\)
Verified Correct Answer: C.
Physical Principles & Numerical Solution
Gun Momentum = bullet momentum
M\(_a\)V\(_a\) = M\(_b\)V\(_b\)
5 x V\(_a\) = 0.05 x 100
V\(_a\) = 1m\(^{-1}\)
Source: Myschool Past Questions Archive (Record #56892)