A 1.0kg ball moving at 10m/s strikes a wall and bounces back. Thecollision is perfectly elastic. What is the ball’s momentum after the collision?(Assume a frictionless surface.)
A.
−100 kg m/s
B.
−10 kg m/s
C.
−1.0 kg m/s
D.
10 kg m/s
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参考答案:
举一反三
【单选题】以下选项中,哪一项将例句中的爆破部分完整地标示出来? A postcard to England doesn’t cost much.
A.
A postcar(d) to Englan(d) doesn’(t) cos(t) much.
B.
A pos(t)car(d) to Englan(d) doesn’(t) cos(t) much.