A body of mass `m` is moved up (slowly) the plane of verying slope by a tangential force upto height `h`. The coefficient of friction between the surface and the block is `mu`.

Select correct option(s)

Options

A. The friction force on the block is Kinetic and variable in magnitude
B. From `A` to `B` work done by frication on the block is `-mumgx`.
C. From `A` to `B` work done by frication on the block is `-mumgxsqrt(h^(2) - x^(2))`
D. From `A` to `B` work done by `F` on the block is `mgh`.

Answer

A, B

Explanation

Since therer is relative motion the frication froce is kinetic. The shape is changing hence force is also changing.