[问答题]
In Fig. 6–31, water balloons are tossed from the
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tb.,5p,w g/72 n h+lwreknigw4oa/vd oof of a building, all with the same speed but with different launch angles. Which one has the
a.ne4 7 r+d ww/,l /kot2gwn 5gihbv,p highest speed on impact? Ignore air resistance.
参考答案:
Since each balloon
has the same initial kinetic energy, and each balloon undergoes the same
overall change in gravitational PE, each balloon will have the same kinetic
energy at the ground, and so each one has the same speed at impact.
本题详细解析:
暂无
