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Q. A 300 kg piano slides 4.50 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.40.
i) The force exerted by the man
ii) the work done by the man on the piano
iii) the work done by the friction force
iv) the work done by the force of gravity
v) the net work done on the piano

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