Two block of masses m1 and m2 are connec...

Two block of masses `m1` and `m2` 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`

spring will be stretched if `a gt mu g `

spring will be compressed if `a le mu g `

spring will neither be compressed nor be stretched for `a le mu g `

spring will be in its natural length under all conditions

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