A crane operator on a building site slowly raises a loaded a crate mass 750kg at a steady speed.(F=mg).Where g=acceleration due to gravity(Approximately=10m/s20).
a. What is the weight of the crate
b. How much is work is done by the force in raising the crate to a height of 5m
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Answer:
a) Weight of crane = m × g
= 750 × 10 = 7500N
b) Potential energy (work) = mgh
= 750 × 10 × 5
= 37500 J
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