A tennis player places a 57 kg ball machine on a frictionless surface. The machine fires a 0.055 kg tennis ball horizontally with a velocity of 35 m/s toward the north. What is the final velocity of the machine? Answer in units of m/s

Alarge cruise ship of mass 7.00 ✕ 107 kg has a speed of 11.6 m/s at some instant. (a) what is the ship's kinetic energy at this time? (b) how much work is required to stop it? (give the work done on the ship. include the sign of the value in your answer.) (c) what is the magnitude of the constant force required to stop it as it undergoes a displacement of 3.00 km?