To determine the motion of the centre of mass of a system, knowledge of internal forces of the system is required.
`For this purpose we need not to know the external forces on the system.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false
D. If both assertion and reason are false.

Answer

D

Explanation

(d) To determine the motion of centre of mass of system, no knowledge of internal forces of the system Squired. For this purpose, we need to know only the external forces on the system.