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Average acceleration = Change in velocity/change in time.

Or, a(av) = Δv/Δt

Or, a(av) = (v2 – v1)/ (t2 – t1)

Where,

a(av) = average acceleration

Δv = change in velocity

Δt = change in time

V2 = final velocity

V1 = initial velocity

t2 = final time

t1 = initial time

The unit of acceleration and average acceleration is same that is m/s.

Three velocities 20 m/s, 40 m/s and 30 m/s

And three times 10 sec, 8 sec and 16 sec.

So, total velocity = 20 + 40 + 30 = 90 m/s

And total time = 10 + 8 + 16 = 34 sec

Therefore, Average acceleration = Δv/Δt = 90/34 = 2.647 m/s^2

Initial velocity = 10 m/s

Final velocity = 30 m/s

Time = 4 sec

So that, Average acceleration = (vf – vi)/t

= (30 – 10)/4 = 20/4 = 5 sec.