a man pulls up a box of mass 70kg using an inclined plane of effective length 5m unto a platform 2.5m high at a uniform speed. If the frictional force between the box and the plane is 100N.(i)draw a diagram to illustrate all the forces acting on the box while in motion. (ii)calculate the (i)minimum effort applied in pulling up the box;(ii) velocity ratio of the plane, if it is inclined at 300 to the horizontal. (iii) force ratio of the plane.?

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