The tension in the cord in problem 21 is (1) \( \frac{m g}{M+m} \) (2) \( \frac{M m g}{M+2 m} \)...

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The tension in the cord in problem 21 is
(1) \( \frac{m g}{M+m} \)
(2) \( \frac{M m g}{M+2 m} \)
(3) \( \frac{2 m g}{M m g} \)
(4) none of these
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