求一道SAT2物理题 力与能相关
求一道SAT2物理题 力与能相关
During a laboratory experiment,a 19.6N pile driver is dropped 2 m on to the head of a nail,which is driven 2.45cm into a wood board.The frictional force exerted by the wood on the nail is ()
During a laboratory experiment,a 19.6N pile driver is dropped 2 m on to the head of a nail,which is driven 2.45cm into a wood board.The frictional force exerted by the wood on the nail is ()
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