[填空题]
At serve, a tennis pl.spb-bo ,kf4;y*c p wdwjbsy c zf6:gs2uo7zj3t.;u 7ayer aims to hit the ball horizontally. What minimum speed is required for the ball to clearuzjgt cw7o 6jzys32fu7:; b.s the 0.90-m-high net about 15.0 m from the server if the ball is “launched” from a height of 2.50 m? $\approx$ Where will the ball land if it just clears the net (and will it be “good” in the sense that it lands within 7.0 m of the net)? How long will it be in the air? $\approx$ See Fig. below.
