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A father pulls his young daughter on a sled, with a constant velocity, a distance of...

A father pulls his young daughter on a sled, with a constant velocity, a distance of 10.0m. The total mass of the sled and girl is 35kg and the coefficient of kinetic friction between the sled runners and the snow is 0.20. The father's pull makes an angel of the 30 degree with the respect to the horizontal. A). How many mechanical work dose the father do? B). What is the net mechanical work done on the girl and sled? C). how much mechanical work is done by kinetic friction?

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