Can someone help please with physics questions

A 696 g ball strikes a wall at 13.3 m/s and
rebounds at 11.3 m/s. The ball is in contact
with the wall for 0.034 s.
What is the magnitude of the average force
acting on the ball during the collision?
Answer in units of N
--------------------------------------…
A(n) 3.4 kg rifle fires a(n) 28 g bullet at
473 m/s.
What is the magnitude of the recoil mo-
mentum of the rifle?
Answer in units of kg · m/s
--------------------------------------…

1.
mass, m = 0.696 kg
velocity, v1 = 13.3 m/s
velocity, v2 = 11.3 m/s
time, t = 0.034
Force, F = m(v1-v2) =

F = 0.696(13.3-11.3) = 1.392 N >=======< ANSWER

2.
rifle mass, M = 3.4 kg
bullet-mass, m = 0.028 kg
speed = 473 m/s,
recoil-speed = v,
SO,
recoil-momentum = Mv = 0.028 * 473

= 13.244 kg.m/s >===================< ANSWER