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26 January, 04:13

By applying a 12-newton horizontal force, a 7-kilogram block is moved 12 meters in 3 seconds on a frictionless, horizontal surface. How much power was used in moving the block.

A) 144 watts

B) 112 watts

C) 16 watts

D) 48 watts

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Answers (1)
  1. 26 January, 04:39
    0
    If a 12-N force is applied continuously through a distance

    of 12m, then the amount of work done is

    (force) x (distance) = (12 N) x (12 m) = 144 joules.

    Power = (work done) / (time to do the work)

    = (144 joules) / (3 sec) = 48 joules/sec = 48 watts.

    We don't care what purpose the force was used for,

    or how much friction was involved.
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