Question

What is momentum? prove that the rate of change of momentum is equal to the applied external force.

Answer 1

Momentum is a physics term; it refers to the quantity of motion that an object has. A sports team that is on the move has themomentum. If an object is in motion (on the move) then it hasmomentum. Momentum can be defined as "mass in motion."
The rate of change of momentum is directly proportional to the net force applied on the body and in the direction of the force. By
Third law when one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body.To every action (force applied) there is an equal but opposite reaction (equal force applied in the opposite direction).