A horizontal surface is partly smooth and partly rough. A particle is projected along the smooth part with speed u. After travelong a distance d, to r

Monjur Alahi

A horizontal surface is partly smooth and partly rough. A particle is projected along the smooth part with speed u. After travelong a distance d, to rest. If `mu` is the coefficient of friction between particle and surface, the distance moved over the rough surface is:
A. `mud`
B. `(d)/(mu)`
C. `(u^(2))/(2mug)`
D. `d - (u^(2))/(mug)`


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Salim Ahmed Kawsar

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Correct Answer - C
`v^(2) == u^(2) + 2 as`
`0^(2) = u^(2) + 2(-mug)s`
`s = (u^(2))/(2mug)`

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