This question is in reference to problem 6E of text book \"CollegePhysics 7th Ed

Question

This question is in reference to problem 6E of text book "CollegePhysics 7th Ed." by Wislon, Buffa, and Lou. The question asksto find how much work the father does in pulling his daughter on asled. The mass of daughter and sled is 35 kg, the coefficient ofkinetic friction between the sled and the snow is 0.20, theangle is 30 degrees. The velocity is constant and the distancepulled is 10m. The answer given in Cramster only takes the normalweight of the child and sled moving along the horizontal plane (Cos) into consideration. Why does it not take the vertical (sin) into consideration?

Explanation / Answer

In other words Work=Force*distance, since there is nodisplacement in the y-direction, distance=0 vertically. Sothere is no work done vertically.
Note: the x-direction is parrallel to the base of thesled

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