A block of mass \( M \) placed on a frictionless horizontal table is pulled by another block of ...

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A block of mass \( M \) placed on a frictionless horizontal table is pulled by another block of mass \( m \) hanging vertically by a massless string passing over a frictionless pulley. The tension in the string is
[MP PET 2010]
(a) \( \frac{m}{M+m} g \)
(b) \( \frac{M}{M+m} g \)
(c) \( \frac{M+m}{M m} g \)
(d) \( \frac{M m}{M+m} g \)
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