"acceleration" is calculated as velocity over time. Velocity is a vector, so it can change in exactly two ways; change of direction and change of magnitude. Even when your speed is constant (i.e. constant magnitude) when you're riding your car, swerving to avoid an accident (i.e. changing direction) is accelerating. That's how.
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your concept of acceleration is quite lousy.
"acceleration" is calculated as velocity over time. Velocity is a vector, so it can change in exactly two ways; change of direction and change of magnitude. Even when your speed is constant (i.e. constant magnitude) when you're riding your car, swerving to avoid an accident (i.e. changing direction) is accelerating. That's how.