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. `mu h `
C. ` mu^2 h`
D. `h^2 mu`

Answer

A

Explanation

From the conservation of energy
` mgh = mu m g d `
` d= (h) /(mu)`