Can someone solve this question for me with an explanation?

Explanation:

Momentum is mass times velocity.

p = mv

a) Before the bullet is shot, it has zero velocity.  So p = 0 kg m/s.

b) Before the bullet is shot, the rifle has zero velocity.  So p = 0 kg m/s.

c) The total momentum is therefore 0 + 0 = 0 kg m/s.

d) If m = 5 g = 0.005 kg, and v = 100 m/s, then:

p = (0.005 kg) (100 m/s) = 0.5 kg m/s

e) Momentum is conserved, so the total momentum before the bullet is shot equals the total momentum after the bullet is shot.

p = 0 kg m/s

f) Since the total momentum is 0:

0 kg m/s = 0.5 kg m/s + p

p = -0.5 kg m/s

g) If M = 995 g = 0.995 kg:

-0.5 kg m/s = (0.995 kg) vr

vr ≈ -0.503 m/s

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i just did this and got a 100.