Question

A force $F=-k{x}^3$ is acting on a block moving along x-axis. Here, k is a positive constant. Work done by this force is:

• A. positive in displacing from x = 3 to x = 1
• B. positive in displacing from x = -1 to x = 3
• C. negative in displacing from x = 3 to x = 1
• D. negative in displacing from x = -1 to x = 3

Answer 1

Answer: (A), (D)

The correct options are
A positive in displacing from x = 3 to x = 1
D negative in displacing from x = -1 to x = 3