# physics 3!! **

A man lifts a 3 kg crate from the floor to a shelf (2 m high) at constant speed*.
What was the change in KE of the crate?
What is the change in the PE of the crate?
If it takes 2 s for the man to lift the crate to the shelf, find the man's power output.

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asked by kelsey
1. The energy (work) required to life any mass against a graviatational force is force*distance or mgh. This translates to a change of PE.

Power=work/time.

I will be happy to check your thinking.

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