I don't see how "the angle" can be 30 degrees if the surface is level. Are you talking about the angle that his pulling force vector makes with the horizontal?
In any case, the work done on a level surface is the friction force times the distance that the sled is pulled (10 m). Use the coefficient of kinetic friction to get the friction force, Ff, using the equation.
Ff = (0.20) M g
a father pulls his young daughter on a sled with a constant velocity on a level surface through a distance of 10-m, if the total mass of the sled a the girl is 35-kg and the coefficent of kinetic friction between the sled runners and the snow is 0.20, how much work does the father do? the angle is 30 deg
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