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给它一个初速度。
I give it a velocity.
youdao
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以初速度为0释放。
I release it with zero speed.
youdao
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在这个实验中,两个光门测量小球的初速度。
For this activity, two photogates measure the initial speed of the ball.
youdao
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在这个实验中,两个光门测量小球的初速度。
For this activity, two photogates measure the initial speed of the ball.
youdao