A block of mass ' \( m \) ' is connected to another block of mass ' \( M \) ' by a spring (massl...

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A block of mass ' \( m \) ' is connected to another block of mass ' \( M \) ' by a spring (massless) of spring constant ' \( k \) '. The blocks are kept on a smooth horizontal plane. Initially the blocks are at rest and the spring is unstretched. Then a constant force ' \( F \) ' starts acting on the block of mass ' \( M \) ' to pull it. Find the force on the block of mass ' \( m \) ' \( \quad \) [AIEEE 2007]
(a) \( \frac{m F}{M} \)
(b) \( \frac{(M+m F)}{m} \)
(c) \( \frac{m F}{(m+M)} \)
(d) \( \frac{M F}{(m+M)} \)
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