newnewnewnew (id: a71a838b3)

本题目来源于试卷: newnewnewnew，类别为 IB物理学

[填空题]
A person jumps from the roof of a house 3.9-m high. When he(xiyxmt1dfnp.ct4. v 3 6mcn1 strikes the ( u+yjqt ezxqj 68 udk6-vd;o7ground below, he bends his knees so that his torso decelerates over an apu6 xt-v6yjd(uj;d+ 7ek8q z qoproximate 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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