First slide

Concept of potential energy

Question

The potential energy of a system is represented in the first figure. the force acting on the system will be represented by

Moderate

A
B
C
D

Solution

As slope of problem graph is positive and constant upto certain distance and then it becomes zero.
So from $F = \frac{- dU}{dx}$ , up to distance a, F = constant (negative) and becomes zero suddenly.

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