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Average velocity = Total displacement/total time

Or V(av) = Δs/Δt

Or V(av) = (S2 – S1)/(t2 – t1)

Where,

S1 = initial distance

S2 = final distance

t1= initial time

t2 = final time

Since, Average velocity is the average value of all the velocities.

So, V(av) = (Vi + Vf)/2

Where, V(av) = average velocity

Vi = initial velocity

Vf = final velocity

Initial velocity= Vi = 40 m/s

Final velocity = Vf = 100 m/s

Since,

V(av) = (Vi + Vf)/2

= (40 + 100)/2 = 140/2 = 70 m/s.

Initial position = 28 m

Final position = 56 m

Initial time = 2.5 sec

Final time = 6.5 sec

Therefore,

Average velocity = (56 – 28)/(6.5 – 2.5)

= 28/4 = 7 m/s.