Physics

Problem

17. Two bodies of masses 5 and 7 kilograms are initially at rest on a horizontal frictionless surface. A light spring is compressed between the bodies, which are held together by a thin thread. After the spring is released by burning through the thread, the 5 kilogram body has a speed of

0.2 \mathrm{~m} / \mathrm{s}

. The speed of the 7 kilogram body is (in m/s) (A)

\frac{1}{12}

(B)

\frac{1}{7}

(C)

\frac{1}{5}

(D)

\frac{1}{\sqrt{35}}

(A)

\frac{1}{12}

(B)

\frac{1}{7}

(C)

\frac{1}{5}

(D)

\frac{1}{\sqrt{35}}

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