A force is given by the vector F6i8j The force moves an obje

A force is given by the vector F=6i+8j. The force moves an object along a straight line from the point (8,6) to the point (8,3). Find the work done if the distance is measured in feet and the force is measured in pounds.

Solution

Displacement = 16i-3j/3.3 m

F=(6i+8j)*4.45 N

As work done is a dot product of force and displacement

W= F.D

W= 97 J