Solutions to Chapter 6 Review Problems

W mg 0200 kg980 ms 2 196 n so the total force is 220

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w = mg = (0.200 kg)(9.80 m/s 2 ) = 1.96 N. So the total force is 22.0 N + 1.96 N = 24.0 N upward . 26. (a) Hitting it back requires a greater force. Force is proportional to the change in momentum. When a ball changes its direction, the change in momentum is greater. If p = p 1 p 2 and p 1 and p 2 are opposite (hitting it back), then p = p 1 – ( p 2 ) = p 1 + p 2 . Had you caught the ball, then p 2 = 0 so p = p 1 . (b) The final velocity is opposite to the initial velocity (“hitting it back”). F avg = p t = mv mv o t = (0.45 kg)( 7.0 m/s 4.0 m/s) 0.040 s = 1.2 × 10 2 N = 1.2 × 10 2 N in direction opposite v o .
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