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Elect the correct equations that show that when a 3.0-kg book is lifted 2.6 m its increase in gravitational potential energy is 78 j .

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The increase in gravitational potential energy for an object of mass m is given by

\Delta U = mg \Delta h
where
\Delta h is the increase in altitude of the object.

In our problem, m=3.0 kg,
\Delta h= 2.6 m and
g=10 m/s^2 (approximated value), so we have

\Delta U = mg\Delta h=(3.0 kg)(10 m/s^2)(2.6 m)=78 J
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