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Question: serving at a speed of 158 kmh a tennis player...

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Serving at a speed of 158 km/h, a tennis player hits the ball at a height of 2.18 m and an angle θ below the horizontal. The service line is 10.1 m from the net, which is 0.95 m high. What is the angle θ in degrees such that the ball just crosses the net? Give a positive value for the angle.

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