what is the magnitude of the recoil velocity of the machine ?

Question

a baseball player uses a pitching machine to help him improve his batting average. he places the 75.7 kg machine on a frozen pond. the machine fires a .197 kg baseball horizontally at a speed of 36.1 m/s. what is the magnitude of the recoil velocity of the machine ?

Answer 1

Concervation of momentum
m1V1=m2V2

V1=(m2/m1) V2=
V1=(.197 / 75.7) 36.1=0.094 m/s