Give an operational definition of acceleration?

Answer 1

"Acceleration" doesn't mean "speeding up". It means the rate at which velocity is changing.

And "velocity" doesn't mean "speed". It means speed and direction.

Answer 2

The change of velocity divided by time required for that change.

Answer 3

Acceleration (a= f/m) Force divided by mass and velocity divided by time a=v/t.

Answer 4

Rate of change of velocity with respect to time.

Answer 5

Any change of speed or direction of motion.

Answer 6

Acceleration is rate of change of velocity (dv/dt). Since velocity is rate of change of position, acceleration works out to dx/dt^2.