Physics

Problem

29. A system consists of two objects having masses

\mathrm{m}_{1}

and

\mathrm{m}_{2}\left(\mathrm{~m}_{1}<\mathrm{m}_{2}\right)

. The objects are connected by a massless string, hung over a pulley as shown, and then released. When the object of mass

\mathrm{m}_{2}

has descended a distance h , the potential energy of the system has decreased by (A)

\left(\mathrm{m}_{2}-\mathrm{m}_{1}\right) \mathrm{gh}

(B)

\mathrm{m}_{2} \mathrm{gh}

(C)

\left(\mathrm{m}_{1}+\mathrm{m}_{2}\right) \mathrm{gh}

(D)

\frac{1}{2}\left(m_{1}+m_{2}\right) g h

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