Question

Question #7338e

Answer 1

The correct answer is 3

Explanation:

Work is defined mathematically as

`W=FDeltad costheta`

The cosine term acts to project the force vector into the direction of the displacement.
For example, if `Deltad` lies in the `x`-direction, then only the component of F that lies in the `x`-direction contributes to the work done by the force.
In general, we consider only the component of F that acts in the direction of `Deltad` when evaluating the work done. (Of course, the magnitude of `Deltad` must not be zero.)

Choice 1 is too restricted and does not correctly allow for two-dimensional motion.
Choice 2 is completely wrong!
Choice 4 - what!?
Choice 5 - the object must move, or no work is done.
Choice 6 - Each force can do work on the object. The net force will determine the change in kinetic energy that results.