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

D

Explanation

Both Newton.s second and third law
By Netwon.s second law for system of particles
If `F_(ext ) = 0`
`0= (d p)/( dt )`
`dp = 0`
p= constant
Momentum of system will be conserved if external force acting on system is zero . In case of collision of particle according to Newton.s third law of motion equal and opposite force will act on individual particles Hence total force on the sytem will be zero.