Question

design a laboratory demonstration to show implications of impulse and change of momentum on two interacting bodies

Answer 1

If we talk about Newton's third law that implies that for a system its total momentum is not acted by outside forces and also is conserved. Income tax to this floor if we try to find out the change of momentum for to interacting bodies then the momentum of a single object changes the moment there is a change in the force on the object for any finite time interval.  On the other hand if there is no change in the net force acting on the body then the momentum will also remain constant. If you talk about the component of the momentum along some specific direction then also if there is no force in the following component be it a sin theta or a cos theta there won't be any Momentum along that component.
m1v1i + m2v2i = m1v1f + m2v2f