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## Homework Statement

Serving at a speed of 170 km/h a tennis player hits the ball at a height of 2.5 m and an angle θ below the horizontal. The service line is 11.9 m from the net, which is 0.91 m high. What is the angle θ such that the ball just crosses the net? Will the ball land in the service box, whose out line is 6.40 m from the net? [ANS: 6. 1°]

## Homework Equations

Vy

^{2}=Voy

^{2}-g(y-y0)

y=y0+½(Vy+V0y)t

x=x0+V0xt

## The Attempt at a Solution

http://blob:https://www.physicsforums.com/e28d4bae-4e89-4ed3-a5bb-353215f729f5 [Broken]

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Please let me know what is the problem in the solution.

i don't know how to find the answer [6.1°]

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