gc physics textbook chapter 4 problems (id: a71a838b3)

本题目来源于试卷: gc physics textbook chapter 4 problems，类别为 通用国际物理

[填空题]
A person jumps from the roof of a house 3.9-m high. W8fh-t1 zrmmx6l : 4etthen he*znzm 3tf2tlq);r* - ;qgnqtop n4c.v strikes the ground below, he bends his knees so that his ;r v-t*nn32tfg*c qm nt.l zo)q4;pqz torso decelerates over an approximate distance of 0.70 m. If the mass of his torso (excluding legs) is 42 kg, find
(a) his velocity just before his feet strike the ground, and   
(b) the average force exerted on his torso by his legs during deceleration.   

参考答案:
空格1: 8.7±2%  空格2: 270±2% 


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