Answer:
The speed of Susan is 2.37 m/s
Explanation:
To visualize better this problem, we need to draw a free body diagram.
the work is defined as:
here we have the work done by Paul and the friction force, so:
Now the change of energy is:
If you were to sit a hot cup of water out side it would frezze faster
Option (D) is the correct one.
In order to increase the amount of work done, we need to increase the force applied to the object.