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Posted by on Saturday, March 31, 2012 at 10:51am.

A block is pulled across the floor by a pull of 400 N at an angle
of 35˚ with the horizontal. The force of the kinetic friction is 150
N, and the block is moved a horizontal distance of 23 m. What
is the resultant work?

  • physics - , Saturday, March 31, 2012 at 10:59am

    I am not sure what they mean by "resultant work"

    The work done by the person pulling is
    400*cos35*23 m= 7536 J

    Of that work, 150*23 = 3450 J is done against friction.

    The resultant force acting on the block does 7536-3450 = 4086 J of work.

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