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(1) The acceleration due to gravity near the surface of Mars is 3.72ms^-2. A rock is thrown straight up from the surface with an initial velocity of 23ms^-2. How high does it go? (Note: gravitational acceleration acts downwards so is negative).

(2) A 30m uniform chain (mass 25kg) is hanging from the roof of a factory. What work is done to wind the chain up onto a drum?

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