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A block of mass ''m' is attached with a mass - less spring of force constant k. The block is placed over a rough inclined surface for which the coefficient of friction is `mu = 3//4`. The minimum value of 'M' required so that the block on the inclined plane is at rest (neglect mass of string and pulley).

A

`(5m)/(4)`

B

`(9m)/(20)`

C

`(7m)/(20)`

D

`(3m)/(5)`

Text Solution

Verified by Experts

The correct Answer is:
C

`mg sin 53^(@) - mu mg cos 53^(@) - Mg = 0`
`M = (7m)/(20)`
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