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> 如图12所示，用线将金属块 M和木块 m连在一起浸没在水中，从静止开始以加速度 a加速下沉.经过 t 1时间，线断了，再经过 t 2时间，木块停止下沉.求此时金属块 M的速度 v m. 图12

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发布时间：2024-09-12

如图12所示，用线将金属块 M和木块 m连在一起浸没在水中，从静止开始以加速度 a加速下沉.经过 t ₁时间，线断了，再经过 t ₂时间，木块停止下沉.求此时金属块 M的速度 v _m.

图12

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