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Quick Physics question on power

  1. Nov 1, 2010 #1
    Hey! please can you explain how i do this (not the answer, just an example of how i could fnd the answer to this question)::

    Q) A crane can lift a 500kg mass (not weight) to a height of 30m in 15s. How much power would the crane have?

    a. 1000 W
    b. 2450 W
    c. 51 W
    d. 9800 W

    I'm guessing it would be 51W but not sure since we havent had any practice @ class....

    Thanks everyone!
  2. jcsd
  3. Nov 1, 2010 #2
    use the definition of power which is the rate of doing work.

    what is the work done by the machine?
    what is the time taken?
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