A particle is projected along the line o...

A particle is projected along the line of greatest slope up a rough plane inclined at an angle of `45^(@)` with the horizontal. If the coefficient of friction is `1//2` . Their retardation is:

`g/sqrt(2)`

`g/(2sqrt(2)`

`g/sqrt2(1+1/2)`

`g/sqrt2(1-1/2)`

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