The work done by Mark can be calculated using the formula:
Work = Force × Distance
In this case, Mark pushed his stalled car with a force of 9000 Newtons. However, since he was unable to move the car, the distance he pushed it is zero. Therefore, the work done by Mark is zero.
To clarify, work is defined as the amount of energy transferred by a force acting through a distance. In order for work to be done, there needs to be both a force applied and a displacement in the direction of the force. Since the car didn't move, there was no displacement, and hence, no work was done.
Keep in mind that work is only done when there is a transfer of energy resulting in a displacement. In this scenario, since the car didn't move, no work was done by Mark.