The forward motion of a bullet shot from a gun causes a recoil of the gun, just as jumping of a person from...?

1. for every action there is an equal reaction, the mass of the projectile going forward is so much less than the combined mass of the rifle & shooter the same amount of force required to propel that small mass of projectile only moves the rifle back a small controllable distance.

2. The mass of the ping pong ball is so little that the paddle is hardly effected, if you struck a tennis ball with the same paddle you would feel the difference.

it relatively is with the aid of Newton's third regulation,"each time a particle A exerts a tension on yet another particle B, B concurrently exerts a tension on A with a similar fee in the different course. The reliable form of the regulation extra beneficial postulates that those 2 forces act alongside a similar line. This regulation is many times simplified into the sentence, "to each action there is an equivalent and opposite reaction." as a effect whilst the bullet of mass m(kg) is fired with a velocity v(m/s) a impulse(I) of mv(N-s) is utilized on the gun of mass M(kg) which flinch with a velocity V(m/s). =>m x v = M x V

I don't understand the third question.