Question

Explain the conservation of momentum according to Newton's third law

Answer 1

the law of conservation of momentum states that when two or more bodies collides there initial momentum is always equal to the final momentum unless an external force acts on them, expression:- M1+U1+M2+U2 = M1+V1+M2+V2
         i hope that this will help u.............................^_^

Answer 2

The law of conservation of momentum states that the total momentum of the system before collision is equal to the total momentum of the system after collision.It means that the momentum is conserved. 
The formula is 
$m_{1} u_{1} + m_{2} u_{2} = m_{1} v_{1} + m_{2} v_{2}$