Work Done By Variable Force

of work is done in sliding a block up an inclined plane of height . Taking m/s², work done against friction is:
1.
2.
3.
4.

Force on a particle moving in a straight line varies with distance as shown in the figure. The work done on the particle during its displacement of m is: 

A force acts on a particle in the -direction where is in Newton and is in metre. The work done by this force to move the particle from to is:
1.
2.
3.
4.