当您的对手是在网附近时,高吊球在网球是有效的.是包括lofting球在他的头,迫使他从网迅速移动.假设您loft球以15.0m/s的最初的速度,有一个角度50.0degree在水平之上.在这瞬时您的对手是10.0m从球.他开始移动后从您0.30s,希望到达球和击中它当时它是2.10m在它的发射点之上,以什么极小的平均速度必须他移动?(忽略事实他可以舒展,因此他的球拍可能到达球,在他.)之前
Help~An English physics problem!hope some on can solve it
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