1.

A solid sphere of mass `m` is lying at rest on a rough horizontal surface. The coefficient of friction between the ground and sphere is `mu`. The maximum value of `F`, so that the sphere will not slip, is equal to A. `7 mumg//5`B. `4 mumg//7`C. `5 mumg//7`D. `7 mumg//2`

Answer» Correct Answer - C
The magnitude will decreases till the direction of the velocity with respect to man becomes vertical. It will increase thereafter.


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