Explain briefly in which situation group velocity can be greater than or less than the phase velocity?

Explain briefly in which situation group velocity can be greater than

1.	Explain briefly in which situation group velocity can be greater than or less than the phase velocity?
Answer» Acceleration is the rate of change of VELOCITY with time. ... Any change in the velocity of an object results in an acceleration: INCREASING speed (what people USUALLY mean when they say acceleration), decreasing speed (ALSO called deceleration or retardation ), or changing direction (called centripetal acceleration )EXPLANATION:hope it hlpz thank u

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Explain briefly in which situation group velocity can be greater than or less than the phase velocity?​

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Explain briefly in which situation group velocity can be greater than or less than the phase velocity?