Space Time & Motion A.2 Forces & Momentum (id: deb2676ee)

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]
While practising, a table ht(* fp/1pr (lua u:ry(n b eejola,.1tennis e.qqo.1m:6 h iz e9wnqve+wm2 player hits a ball of mass $2.8g$ that collides with the floor and then bounces back from the wall. The speed of the ball just before reaching the floor is $8.0m{s}^{-1}$. The ball leaves the floor with an angle of ${65}^{\circ }C$ to the floor as shown.



1. Due to the collision with the floor, the ball losses 30% of its initial kinetic energy. Calculate the leaving speed of the ball from the floor. $v$ =    $m{s}^{-1}$
2. The ball strikes the wall just as it reaches the highest point of its motion. Determine the horizontal distance between the bounce point and the wall. $d$ =    $m$
3.The ball collides elastically with the wall, with the time of contact during the collision is $0.040s$. Calculate the average horizontal force exerted by the wall on the ball during the collision. $F_{ave}$ =    $N$

参考答案:
空格1: 6.7±5%  空格2: 1.8±3%  空格3: 0.40±3% 


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