Question: a ) A 2 0 N crate is lifted 5 m from the floor onto a shelf at a speed of 1 5 ms -

a) A 20 N crate is lifted 5 m from the floor onto a shelf at a speed of 15ms-1. How much kinetic energy is used to lift the crate? Assume that the force of gravity is 10ms-2
b) How much potential energy does the 20 N crate have whilst sat on the self?

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