For a system to follow the law of conservation of linear momentum during a collision, the condition is (1) Total external force acting on the system is zero (2) Total external force acting on the system is finite and time of collision is negligible (3) Total internal force acting on the system is zero

Options

A. (1) Only
B. (2) Only
C. (3) Only
D. (1) or (2)

Answer

a

Explanation

According to Newton second law of motion
`F=dP/dt`
when` F=dP/dt=0 `
i.e, dP/dt become zero only when P is a consatnt.
threfore the condition for the system to follow law of conservation of energy is that, t5otal externalo force acting on the system is zero.