Net momentum is the total momentum of a system. It is the vector sum of the individual momentums of all objects within the system.
Net momentum is calculated by multiplying the mass of an object by its velocity and adding the momentums of all objects in the system together.
Net momentum is important because it helps us understand the overall motion and interactions of objects within a system. It can also be used to predict the future motion of the system.
When two rockets are launched, the net momentum will depend on the individual momentums of each rocket. If the rockets have the same mass and velocity, the net momentum will be zero. However, if the rockets have different masses or velocities, the net momentum will be non-zero.
Yes, the net momentum of a system can change if there is a change in the individual momentums of objects within the system. In the case of two launched rockets, the net momentum of the system will change as the rockets continue to move and accelerate.