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a 0.50g leaf falls from a branch 4.0m off the ground to a bird's nest 2.5m off the ground. How much gravitational potential energy did the leaf loose?

Answer :

AL2006
Difference in gravitational potential energy =

                         (mass) x (gravity) x (difference in height)

                   =    (0.0005 kg) x (9.8 m/s²) x (4m - 2.5m)

                   =    ( 0.0049 kg-m/s²)  x  (1.5 m)

                   =            0.00735 joule .

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