Question

Question #050a0

Answer 1

Let the height of the inclined plane be `h` and length of the inclined plane be `l`.

If `m` represents mass of the block and `g` represents acceleration due to gravity, then weight of the body will be `w=mg`

The work done in raising the block to the top of the plane by applying force `mg` along the plane is given by `mgl` (assuming the plane is frictionless).When the block reaches at the top it will have both KE and PE.

As the block reaches at height h it will gain gravitational PE `=mgh`

Hence

`mgh+KE=mgl`

`=>KE=mg(l-h)`