3 英文 X
4800 kg block falls vertically
through 7.4 mandthen collides
With a 370 kg pile, driving 上芷4.8 cm
into bedrock. Assuming that the
block-pile collision is completely
inelastic,find the magnitude ofthe
average force on the pile from the
bedrock during the 4.8 cm descent.
相機 對話