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PHYSICS PLEASE HELP BILLY!!! there are about thr

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A 10.2 kg crate is pulled up a rough incline
with an initial speed of 1.5 m/s. The pulling
force is 123.0 N parallel to the incline, which
makes an angle of 14.6◦ with the horizontal.
The coecient of kinetic friction is 0.39 and
the crate is pulled a distance of 8.1 m.
The acceleration of gravity is 9.81 m/s2 .

a) Find the work done by Earth’s gravity
on the crate. Answer in units of J.

  • PHYSICS PLEASE HELP BILLY!!! there are about thr -

    You don't need to worry about friction to know how much work was done by, or against, gravity. It equals the change in potential energy, which is
    M g * (change in elevation).
    Put a minus sign in front of it to get the work done BY gravity.
    The change in elevation is
    H = 8.1 sin 14.6 meters

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