Thank you for reporting, we will resolve it shortly
Q.
The potential energy of a system is represented in the first figure. The force acting on the system will be represented by
Work, Energy and Power
Solution:
As slope of problem graph is positive and constant up to certain distance and then it becomes zero.
So from $F=\frac{-dU}{dx},$up to distance $a, F =$ constant
(negative) and becomes zero suddenly
