What is the momentum of a moving body 

Explanation:

Momentum:

• The momentum of a body is defined as the product of its mass and velocity.
• It is a vector quantity and has a direction the same as the direction of velocity.
• A moving body will have a constant momentum if and only if the direction of motion stays constant and the product of (mass x velocity) stays constant.
• Newton's second law of motion states that the rate of change of a body's momentum is equal to the net force acting on it.
• Momentum depends on the frame of reference, but in any inertial frame it is a conserved quantity, meaning that if a closed system is not affected by external forces, its total linear momentum does not change.
• Momentum is also conserved in special relativity (with a modified formula) and, in a modified form, in electrodynamics, quantum mechanics, quantum field theory, and general relativity.
• It is an expression of one of the fundamental symmetries of space and time: translational symmetry.
• If it is conserved, the collision is called an elastic collision; if not, it is an inelastic collision.
• An elastic collision is one in which no kinetic energy is transformed into heat or some other form of energy.
• Perfectly elastic collisions can occur when the objects do not touch each other, for example in atomic or nuclear scattering where electric repulsion keeps the objects apart.
• In an inelastic collision, some of the kinetic energy of the colliding bodies is converted into other forms of energy (such as heat or sound).
• Examples include traffic collisions in which the effect of loss of kinetic energy can be seen in the damage to the vehicles; electrons losing some of their energy to atoms