Acceleration is the rate at which what happens?

When the velocity of an object changes it is said to be accelerating. Acceleration is the rate of change of velocity with time. In everyday English, the word acceleration is often used to describe a state of increasing speed. ... Acceleration occurs anytime an object's speed increases or decreases, or it changes direction.

Explanation:

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Acceleration is the rate of change of velocity with time.

Explanation:

idk if this is right im sorry lol

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.