A 3.0-kg crate rests at the bottom of a plane inclined at an angle of 15.0 $\circ$ above the horizontal.The crate is given a push up the plane and when it has travelled a distance of 2.0 m up the plane its speed is 3.0 m/s.How much work is done on the crate by gravity?

Question

Quizplus · Accepted Answer

Work done by gravity is given by W = mgh, where m is the mass of the crate, g is the acceleration due to gravity, and h is the height through which the crate is lifted. In this case, the height is 2.0 m * sin(15.0°) = 0.532 m. Therefore, the work done by gravity is W = (3.0 kg) * (9.8 m/s^2) * (0.532 m) = -15 J.

A 30-Kg Crate Rests at the Bottom of a Plane Inclined