Consider a frictionless rampp on which a smooth object is made to slide down from an initial height h . The distance d necessary to stop the object on a flat track ( of coefficient of friction `mu ` ) , kept at the ramp end is

Options

A. `h/mu`
B. `muh`
C. `mu^2h`
D. `h^2mu`

Answer

A

Explanation

Answer(1) From conservation of energy, mgh = `mu mgd`
`Rightarrow h = mud` .
`therefore d = h/mu`.