手托着重为30N的物体，以大小为5m／s2的加速度作竖直向下

更新 2022-09-03
科目物理
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挑错有奖

手托着重为30N的物体，以大小为5m／s²的加速度作竖直向下的运动，（g取10m/s²）则手对物体的托力是（）

A．15N

B．20N

C．30N

D．45N

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