Kevin S. Huang

2009: Problem 12

Topic: Energy
Concepts: Gravitational potential energy, Work-energy theorem

Solution:

Batman does work to increase his own gravitational potential energy by $Mgh$ .

Then he does work to increase Robin’s gravitational potential energy by $mgh$ . The total work he does is

W=(M+m)gh=(100\,\mathrm{kg}+75\,\mathrm{kg})(10\,\mathrm{m/s^2})(30\,\mathrm{m})=5 \times 10^4\,\mathrm{J}

so the answer is C.

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2009, F=ma Exam

Fma: Energy, Gravitational potential energy, Work-energy theorem

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