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What power is needed to lift a 410-kg crate of bricks from the ground to the...

What power is needed to lift a 410-kg crate of bricks from the ground to the top of a 21.5-m-high building in 7 minutes? Give your answer in Watts.

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Answer #1

Work done in lifting= Change in potential energy

Then,  

Using given and known values in above,

Time taken,

Then,

Power needed to lift is given by,

  (ANS)

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