Two block of masses \( m_{1} \) and \( m_{2} \) are connected with a massless unstretched spring...

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Two block of masses \( m_{1} \) and \( m_{2} \) are connected with a massless unstretched spring and placed over a plank moving with an acceleration \( a \) as shown in figure. The coefficient of friction between the blocks and platform is \( \mu \).
(a) Spring will be stretched if \( a\mu g \).
(b) Spring will be compressed if \( a \leq \mu g \).
(c) Spring will neither be compressed nor be strecteched for \( a \leq \mu g \).
(d) Spring will be in its natural length under all conditions.
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