# 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?

Category: QuestionsIn a uniformly accelerated motion, the speed varies from 0 to 20 m/s in 4 s. What is the average speed during the motion?
Editor">Editor Staff asked 1 year ago

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/s

The 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
Select the correct answer from above options
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Editor">Editor Staff answered 1 year ago

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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