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Average acceleration = Δv/Δt

Or, Average acceleration = (vf – vi)/(tf – ti)

Where, Δv = change in velocity

Δt = change in time

Vf = final velocity

Vi = initial velocity

tf = final time

and ti = initial time

Unit of average acceleration is same as acceleration that is m/s.

If a bike moves from the rest to 6 m/s in 3 sec. its average acceleration will be 6/3 = 2 m/s.

Initial velocity = 4 m/s

Final velocity = 10 m/s

And time elapsed = 3 sec

We have the equation for the average acceleration,

Average acceleration, a = (vf – vi)/t = (10 – 4)/3 = 6/3 = 2 m/s

Initial velocity = 50 mph

Final velocity = 300 mph

Initial time = 10:30

Final time = 10:45

Difference of time = (10:45 – 10:30) = 15 min = 15/60 hr = 0.25 hr

So, average acceleration = (300 – 50)/(10:45 – 10:30)

= 250/0.25

= 1000 mph^2