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A plank of mass m(1) with a sphere of ma...

A plank of mass `m_(1)` with a sphere of mass `m_(2)` on it rests on a smooth horizontal surface. A canstant horizontal force F is applied to the plank. With what sliding between the plank and the sphere?
[hint: Rel vel. Of the lowest point `v-(2) + epsilonR -v_(1)`=0 for no sliding)

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The correct Answer is:
`(7F)/(7m_(1)+2m_(2))`,`(7F)/(7m_(1)+2m_(2))`
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