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04-02-2008, 01:22 AM
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| i need help with physics please...?
A man lifts a 7 kg crate from the floor to a shelf (9 m high) at constant speed*. (*Neglect the very start and very end of the lift, where the crate would of course need to be accelerated from/to rest.) a)What is the change in the PE of the crate? b)If it takes 5 s for the man to lift the crate to the shelf, find the man's power output.      |
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