(a)[2]
Find the change in gravitational potential energy for the box.
(b)[2]
Find the work done by the force pulling the box.
Mathematics 9709 · AS & A Level · Energy, work and power
Energy, work and power — practice question
A box of mass $5\,\text{kg}$ is moved at a constant speed of $1.8\,\text{m s}^{-1}$ for $15\,\text{s}$ up a rough plane inclined at an angle of $20^\circ$ to the horizontal. It travels along the line of greatest slope and acts against a frictional force of $40\,\text{N}$. The force pulling the box is parallel to the line of greatest slope.
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