A tennis player places a 54 kg ball machine on a frictionless surface. The machine fires a 0.057 kg tennis ball horizontally with a velocity of 38 m/s toward the north. What is the final velocity of the machine?
m/s to the south
physics - drwls, Tuesday, January 25, 2011 at 10:50pm
Total momentum remains zero. After the ball is thrown, ball momentum and machine momentum are equal and opposite.