Q1. A 4.00-kg model rocket is launched, expelling 54.9 g of burned fuel from its exhaust at a speed of 690 m/s. What is the velocity of the rocket after fuel has burned?
Q2. A 0.004 kg bullet, moving 536 m/s, strikes a 0.252 kg piece of wood at rest on a frictionless table. The bullet in wood and combined mass moves slowly down the table. Find out the speed of the combination after collision?