physics

An 8kg block starts from rest from the top of a plane, inclined at 40o with respect to the horizontal, and slides down at a
constant acceleration. If the coefficient of kinetic friction between the block the plane is 0.35 determine how far the
block travels in 3s.
2013/

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  1. constant acceleration....

    down the plane: mgsinTheta
    friction up the plane: mg*mu*cosTheta

    Net force=ma
    mg sinTheta-mg*mu*cosTheta=ma
    a= g(sinTheta-muCosTheta)

    find a, then

    distance=1/2 a t^2 solve for distance

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