In a car crash test of original length L hits a concrete wall and comes to a full stop without bouncing back. The wrecked car is now ?L shorter. During collision, the average force applied to the car by the wall is F. Consider the car as system and suppose that yu are stationary with respect to the wall. How much work would you say the wall does to the car
a. F?L
b. F?L/2
c. -F?L
d. -F?L/2
e. 0