Ahorse draws a sled horizontally across a snow-covered field. the coefficient of friction between the sled and the snow is 0.135, and the mass of the sled, including the load, is 195.9kg. if the horse moves the sled at a constant speed of 1.785m/s, what is the power needed to accomplish this?

P = 462.62 watts

Explanation:

The power needed to accomplish this can be calculated how

P = Fv

    Where F:  The force exerted by the horse

                v:  velocity

The force exerted by the horse is against friction force; how the movement is with constant velocity these forces must be equals, then

Fr = μN

    =μmg

    = (0.135)(195.9)(9.8)

    = 259.17 N

And the power is

P = (259.17)(1.785)

P = 462.62 watts

the correct choice is a .

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that would be because of both gravity and friction. so     c