Suppose that you loft the ball with an initial speed of v = 16.1 m/s, at an angle of θ = 51.8° above the horizontal. At this instant your opponent is d = 10.7 m away from the ball. He begins moving away from you 0.300 s later, hoping to reach the ball and hit it back at the moment that it is h = 2.02 m above its launch point. With what minimum average speed must he move? (Ignore the fact that he can stretch, so that his racket can reach the ball before he does.)

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A: here, r⇀=(2.00t3-5.00t)i^ + (6.00-7.00t4)at t = 2.00 s

Projectile Motion