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1. For a top player, a tennis ball may leave the racket on the serve with a speed of 55 m/s (about 120 mi/h). If the ball has a mass of 0.060 kg and is in contact with the racket for about 4 ms (4 x 10-3 sec.), estimate the average force on the ball. 2. A 10,000 kg railroad car A, traveling at a speed of 24.0 m/s strikes an identical car, B, at rest. If the cars lock together as a result of the collision, what is their common speed just afterward? 3. A 1 kg ball moving at 12 m/s collides head-on with a 2 kg ball moving in the opposite direction at 24 m/s. Determine the motion of each after impact of (a) e = 2/3, (b) the balls stick together, and (c) the collision is perfectly elastic. 4. A 40,000 kg truck car is coasting at a speed of 5 m/s along straight track when it strikes a 30,000 kg stationary truck and couples it. What will be their combined speed after impact?
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