[填空题]
At serve, a tennis player ailc.mt 3r702jd u2ehyc)socy3f 6 s,qq ms to hit kdgin8-lr* lxw /x7 u,the ball horizontally. What minimum speed is required for the ball to clear the 0.90-m-high net about 15.0 m from the server if the ball is “launched” from a heighg*w7x/-r xnk l,il8dut 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.
