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Q.what is instantaneous velocity and quantum theory.??​

Answer 1

Answer:

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Instantaneous velocity:

The physical velocity of a body in a point, or instantaneous velocity, is the velocity the body has at a specific time in a particular point of its trajectory. Instantaneous velocity, or simply velocity, is defined as the limit of the average velocity when the time change approaches zero.

Quantum theory:

Quantum mechanics (QM; also known as quantum physics, quantum theory, the wave mechanical model and matrix mechanics), part of quantum field theory, is a fundamental theory in physics. It describes physical properties of nature on an atomic scale.