The force of gravity acts only while objects are moving down
The force of gravity acts only while objects are moving downwards.
还有一题也是T/F的：（帮个忙一起写了哈）
Constant motion (i.e.steady speed) requires a constant force.
还有一题也是T/F的：（帮个忙一起写了哈）
Constant motion (i.e.steady speed) requires a constant force.
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