Question

The motion of centre of mass depends on

• A. total external forces
• B. total internal forces
• C. sum of $\left(a\right)$ and $\left(b\right)$
• D. None of these

Answer 1

The correct option is A total external forces

The motion of centre of mass depends only on the net external force.

Let M be the total mass.

${\overrightarrow{F}}_{external}=M{\overrightarrow{a}}_{CM}$