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In a uniformly accelerated motion, the speed varies from 0 to 20 m/s in 4 s. What is the average speed during the motion?

In a uniformly accelerated motion, the speed varies from 0 to 20 m/s in 4 s. What is the average speed during the motion? Correct Answer 10 m/s

From first equation of motion we have, v = u + at, which implies that a = 5 m/s2. From second equation of motion we have s = ut + (1/2)at2, which implies that s = 40 m. Average speed = s/t = 40/4 = 10 m/s.

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