A 50kg baseball pitching machine is placed on a frozen pond.?

Question

It fires a .150kg baseball at an angle of 30 degrees with the vertical at a speed of 20 m/s. What is the recoil velocity of the machine?

Answer 1

the impuls (m*v) is conserved, so the impulse in one direction;
0.150*20*sin(30deg)
Equals the impulse in the other direction
50*v_recoil
the recoil velocity is thus 0.03 m/s