Space Time & Motion A.2 Forces & Momentum (id: 28d290d07)

本题目来源于试卷: Space Time & Motion A.2 Forces & Momentum，类别为 IB物理学

[填空题]
The motion of an object released from /p*z)nlk5w1idx p)n:sb ydy ;a high na8 vwc,qw/gd i9 kr20 c6a.h*rqt ih8r2;bqnplace in a vacuum is observed. The variation of its velocity with time is recorded a6wwq/ ai*a2, nrh0rv cih8tb.qq; 98gk drc2nnd the following graph is obtained.



1.Discuss the role that observations play in the development of scientific understanding.

2.Other than velocity and time, Can both displacement and acceleration be obtained from the graph?  ----待选择----yesno 

3.
(1) The height of the release point is $70\,m$. Calculate the speed $v_1$​ of the object just before the contact with the ground. $v_1$ =    $ms^{-1}$
(2)The object rebounds from the ground with a speed $v_2$​ of $17\,ms^{−1}$. The mass of the object is $8.0\,kg$ and the contact time during the rebound is $0.50\,s$. Calculate the average force acting on the object from the ground. $F$ =    $N$

参考答案:
空格1: yes  空格2: 37.06±2%  空格3: 942±3% 


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