A body is projected up along a rough...

A body is projected up along a rough inclined plane of inclination ` 45 ^@ ` . The coefficient of friction is 0.5. Then the retardation of the block is

`4.9 m//s^2`

`frac(98)(sqrt2)m//s^2`

`9.8 m//s^2`

`frac(98)(2sqrt2)m//s^2`

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