A stationary ball is hit by an average force 50n for a time of 0.03sec.what is the impulse experience by the body

Answer 1

impulse = F delta t = m a delta t = m delta v = change in momentum
= 50 N * 0.03 sec = 1.5 kg m / s

If you knew the mass of the ball, you would divide by that to get the speed.