Question

A body is moving with a constant acceleration of 4î + 3ĵ, starting from the origin. What will be the position of the body after 5s?

(a) 50î + 37.5ĵ

(b) 37.5î + 50ĵ

(c) 37.5î –  50ĵ

(d) 50î – 37.5ĵ

I got this question during a job interview.

The above asked question is from Motion in a Plane topic in section Motion in a Plane of Physics – Class 11

Answer 1

The correct answer is (a) 50î + 37.5ĵ

Explanation: The body’s displacement is given by s = (1/2)at^2. The body starts from the origin hence, the total displacement is the final position of the body. Therefore, after putting in the values, we get, s = (1/2)(4î + 3ĵ)*5^2 = 50î + 37.5ĵ.