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April 20, 2014

Homework Help: physics

Posted by Mota on Saturday, January 30, 2010 at 7:35am.

A man drags a sack of flour of mass 50 kg at
constant speed up an inclined plan to a height of 5m. The plane makes an angle of 30„awith the horizontal and a constant frictional force of 200 N acts on the sack down the plane.
1- How much work does the man do
A- against friction.
B- against gravity.
C- against normal force.
2- Total work done by the man.

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