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?(a) 10 m/s(b) 20 m/s(c) 0 m/s(d) 15 m/sThe question was posed to me by my school principal while I was bunking the class.The doubt is from Straight Line Motion in division Motion in a Straight Line of Physics – Class 11

In a uniformly accelerated motion, the speed varies from 0 to 20 m/s i

1.	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?(a) 10 m/s(b) 20 m/s(c) 0 m/s(d) 15 m/sThe question was posed to me by my school principal while I was bunking the class.The doubt is from Straight Line Motion in division Motion in a Straight Line of Physics – Class 11
Answer» Correct answer is (a) 10 m/s To explain: From FIRST equation of motion we have, v = u + at, which implies that a = 5 m/s^2. From second equation of motion we have s = ut + (1/2)at^2, which implies that s = 40 m. Average SPEED = s/t = 40/4 = 10 m/s.

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