a man uses a rope to haul a box of weight 600N up an inclined wooden plank of effective length 3m and onto a platform 1m high. If I'm doing so, he exerts a force of 400N on the rope, calculate (1) the frictional force between the case and the plank; (2) the velocity ratio of the machine; (3) the mechanical advantage; (4) the useful work done in joules.?
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Asked by Anichebe Obinna on 21st January, 2020
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