Conservation of momentum in a collision between particles can be understood from

Options

A. conservation of energy
B. Newton's first law only
C. Newton's second law only
D. Both Newton's second and third law

Answer

C

Explanation

We know that for a system `F_("ext")=(dp)/(dt)` (from Newton's second law)
If `F_("ext")=0, dp=0 implies p=` constant
Hence, momentum of a system will remain conserve if external force on the system is zero.
In case of collision between particles equal and opposite forces will act on individuel particles by Newrons third law,
Hence total force on the system will be zero.