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 IB物理学

[填空题]
A person jumps from the roof of a house)a +qxama v(0m 7zlvo: 3.9-m high. Whcv00dw 5bqt7 ten he strikes the ground below, he bends his knees so that his torso decelerates over an approximate distance of 0.70 m. If the mass of his torso05qwtct 0bv d7 (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% 


本题详细解析:

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