Solve the all parts of given question:
Question: A rifle with a weight of 25 N fires a 3.5 g bullet with a speed of 280 m/s.
Part I: Find the recoil speed of the rifle.
m/s
Part II: If a 725 N man holds the rifle firmly against his shoulder, find the recoil speed of the man and rifle.
m/s
Show all work, use additional paper if necessary.