A block `B` is pushed momentarily along a horizontal surface with an initial velocity `v` . If mu is the coefficient of sliding friction between `B` and the surface, block `B` will come to rest after a time:

Options

A. `V// (g mu)`
B. `g mu V `
C. `g//V`
D. `V//g`

Answer

A

Explanation

`a = mu g `
`v = u - at implies t = (u)/(a) = (V)/(mu g)`