Question

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

• A.
• B.
• C.
• D.

Answer 1

Answer: (C)

Answer 2

As slope of problem graph is positive and constant upto distance a then it becomes zero. Therefore from $F = - \frac { d U } { d x }$ we can say that upto distance a force will be constant (negative) and suddenly it becomes zero.