Here is a weighing machine and that's you standing on the elevator.
这是个称重器,然后你在电梯里
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But if I'm accelerating, the force exerted by the spring and therefore, the needle the weighing machine reads is m.
但是如果我在加速运动,那么弹簧的弹力,也就是称重机上指针的读数就是 m
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模块上移
模块下移
不移动