Question

If force acting on a system is zero. the quantity which remains constant

• A. acceleration
• B. linear momentum
• C. potential energy
• D. Kinetic energy

Answer 1

Answer: (B)

linear momentum

According to Newton's second law: $F=\frac{\Delta P}{\Delta t}$, where $\Delta P$ is the change in linear momentum and $\Delta t$ is the change in time.

When $F=0$, $\Delta P=0$.

So, when the force acting on the system is zero, the linear momentum is not changing, or it is a constant.