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April 19, 2014

Homework Help: science

Posted by Thalente on Tuesday, March 26, 2013 at 10:08am.

at a construction site a crane lifts a block of mass,m,vertically upwards through a height of 70 m at constant speed by means of a strong cable.The block experiences a force of magnitude 8 N as a result of air friction as it is lifted vertically upwards.
The cable does 377 860 J of work in moving the block through a height of 70 m.calculate the mass of the block.

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