a man uses a roqe to haul box of weight 600N up an inclined wooden...

a man uses a roqe to haul box of weight 600N up an inclined wooden plank of effective lenght 3.0m and onto a platforn 1.0m high if in 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 workdone in joulesa man uses a roqe to haul box of weight 600N up an inclined wooden plank of effective lenght 3.0m and onto a platforn 1.0m high if in 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 workdone in joules?

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Asked by oloriebi on 4th October, 2019