Question

In the first 10s of a body’s motion, the velocity changes from 10 m/s to 20m/s. During the next 30s the velocity changes from 20m/s to 50m/s. What is the average acceleration in m/s^2?

(a) 1

(b) 2

(c) 3

(d) 0.5

This question was addressed to me during an online interview.

I'm obligated to ask this question of Kinematic Equations for Uniformly Accelerated Motion in portion Motion in a Straight Line of Physics – Class 11

Answer 1

Correct choice is (a) 1

To explain I would say: Average acceleration is the total change in velocity by the total change in time. Here, total change in velocity = 50-10 = 40m/s, and total change in time = 30+10 =40s. Therefore, average acceleration = 1 m/s^2.