1. A 1000-kg cart is riding to the right at 5.0 m/s, and a 70-kg athlete is stan

Question

1. A 1000-kg cart is riding to the right at 5.0 m/s, and a 70-kg athlete is standing on the right end of the cart. Suddenly the athlete starts sprinting to the left with a speed to 10 m/s relative to the cart. a) What

1. A 1000-kg cart is riding to the right at 5.0 m/s, and a 70-kg athlete is standing on the right end of the cart. Suddenly the athlete starts sprinting to the left with a speed to 10 m/s relative to the cart. a) What as the speed of the cart while the athlete is sprinting? Draw a complete before-and-after pictorial representation (use the tactics box at the top of p. 224) b) Repeat the same problem if the athlete starts from the left end and sprints to the right with the same speed.

Explanation / Answer

(m1 + m2) v = m1 v1 + m2 v2 => ( 1000 + 70 ) 10 = 1000 v1 + 70x -10 => v1 = 11.40m/s.

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