The force acting on a body of mass 
in the direction of motion changes with the distance travelled as shown in Figure 1 below.
How much work does the force do to travel a total distance, 
?
What is the final velocity of the body if the body is initially at rest?
What is the final velocity of the body if the initial velocity of the body is 
?
Figure 1: Force-distance graph
.
.
is 
.
