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22 April, 20:10

A crane raises a 150 N weight to a height of 2.0 m in in 5.0 s. The crane does work at a rate of

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  1. 22 April, 21:01
    0
    Calculate work done using formula;

    WD=F x s (distance)

    = 150N x 2m

    =300Joules

    If power, use work done above divide by the time taken which is 5s
  2. 22 April, 22:39
    0
    The work done is (force) x (distance) = (150N) x (2m) = 300 joules.

    The crane does the work at the rate of (300 J) / (5 sec) = 60 joules per second.

    That rate ... (work done) / (time to do the work) ... is called power.

    That 60 joules per second is called 60 watts.
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