Q1. A 4.20 kg model rocket is launched, expelling 57.0 g of burned fuel from its exhaust at a speed of 675 m/s. What is the velocity of the rocket after fuel has burned? Hint: Ignore the external forces of gravity and air resistance.
Q2. A 95 kg man lying on a surface of negligible friction shoves a 64 g stone away from himself, giving it a speed of 4.0 m/s. What speed does the man obtain as a result?