What is instantaneous acceleration?

Explanation:

Instantaneous acceleration is the acceleration at a particular instant.  Mathematically, it is the first derivative of velocity, dv/dt.

Average acceleration, on the other hand, is the acceleration over a period of time.  It is the change in velocity divided by the length of time, Δv/Δt.

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

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