Physics

Problem

Which expression gives the change in gravitational potential energy

\Delta U

of an object of mass

m

lifted vertically by a distance

\Delta y

near Earth’s surface where the acceleration due to gravity

g

is approximately constant? a)

\Delta U = -mg\,\Delta y

\Delta U = \dfrac{1}{2}mg\,\Delta y

\Delta U = mg\,\Delta y

\Delta U = -\dfrac{G m M_E}{\Delta y}