UNIT 4 WORKSHEET 13: Two Mass Systems 1. A 20 kg block A rests on a table; a cord attached to the block extends horizontally to a pulley at the edge of the table. Assume block A has a coefficient of fricition of . 1 . A 10 kg block B hangs at the end of the cord. a) Draw force diagrams on system at right. Generate force equations b) Calculate the acceleration of the entire system. c) How long will it take B to drop 2 m? 2. Vern and Billy Sue are parked 10.0 m from the edge of a cliff in a car whose mass, including them, is 1000 kg. A jealous suitor ties a rope to the car's bumper and a 50 kg rock to the other end of the rope. He then lowers the rock over the edge of the cliff, and the car, which is in neutral, accelerates toward the edge. (Ignore frictional forces.) a) Draw two force diagrams for the rock and the car. Derive the force equations. b) What is the acceleration of the car towards the edge? c) How much time do Vern and Billy Sue have before they go over the edge