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In the adjoining figure all surface are ...

In the adjoining figure all surface are frictionless . What force `F` must by applied to `M_(1)` to keep `M_(3)` free from rising or falling?

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`FBD` of `M_(2)` and `M_(3)` in accelerated frame of reference is shown in figure
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DC PANDEY ENGLISH-LAWS OF MOTION-Subjective Question
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