Test "Momentum" What collision is called elastic? What collision is called absolutely inelastic? (2 marks, K] A 1500 kg car travels east at 20 m/s. What are its momentum and kinetic energy? (2 marks, K) What impulse is needed to stop a 1500 kg car rolling north at 2.0 mfs? (3 marks, A) A 1.0 kg ball travelling at 10.0 m/s [N] strikes a wall and rebounds at 8.0 m/s [5]. The impact lasts 0.050 s. a. What was the impulse on the ball? (2 marks, A) b. What was the average force acting on the ball? [2 marks, K] c. What was the average force acting on the wall? (1 mark, it) A 1500 kg car travelling at 20.0 m/s [E] collides head-on with a 1.0x103 kg pickup truck. As a result of the collision, both vehicles come to a complete stop. What is the velocity of the truck before the collision? (3 marks, K} Two balls collide on a horizontal, frictionless table. Ball A has a mass of 0.20 kg and is travelling at 1.0 m/s [E45S]. Ball B has a mass of 0.25 kg and is travelling at 0.70 mfs [E]. The velocity of ball B after the collision is 0.80 m/s [E31'S]. a. What is the magnitude and direction of the velocity of ball A after the collisioo? Draw a diagram. [4/2 marks, TIC] b. What percentage of kinetic energy is lost in the collision? (2 marks, T) A -1.0>