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Q1. Travelling at the speed of 14.10 m/s, driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.650. What is the speed of automobile after 1.130 s have elapsed? Overlook the effects of air resistance.

Q2. Suppose that you lob the ball with an initial speed of v = 17.0m/s, at an angle of θ = 50.7° above the horizontal. At this instant your opponent is d = 11.7m away from the ball. He begins moving away from you 0.300s later, hoping to reach the ball and hit it back at the moment that it is h = 2.18m above its launch point. With what minimum average speed should he move? (Overlook the fact that he can stretch, so that his racket can reach the ball before he does.)

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