A body is moving along a rough horizontal surface with an initial velocity 6m/s m If the body comes to rest after travelling 9 m , then the coefficient of sliding friction will be

Options

A. 0.5
B. 0.4
C. 0.6
D. 0.2

Answer

D

Explanation

(d) Retardation,`a=(mu mg)/(m)=mu g=10 mu`
Now, `0=u^(2)-2as" or " 0=(6)^(2)-2(10mu)(9)`
`therefore" " mu=0.2`