Serving at a speed of 170 km/h, a tennis player hits the ball at a height of 2.5 m and an angle below the

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.

Part (a)  Find the angle θ, in degrees, at which the ball just crosses the net. 

θ =

Part (b)  At what distance, in meters, from the service line does the ball land? 

R =