At serve, a tennis player aims to strike the ball horizontally. Determine what minimum speed is needed for the ball to clear the .90 m high net around 15 m from the server, when the ball is "launched" from a height of 2.5 m? Where will the ball land if it just clears the net (and will it be ‘good’ in the sense that it lands in 7.0 m of the net)? Determine how long will it be in the air?