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The velocity of a body, moving in a plane, changes from 3î to 3î + 7ĵ in 10s. What is the acceleration of the body?

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The velocity of a body, moving in a plane, changes from 3î to 3î + 7ĵ in 10s. What is the acceleration of the body?

(a) 0.7ĵ

(b) 0.7î

(c) 0.33î + 7ĵ

(d) 0.3î + 7ĵ

The question was asked in an interview for internship.

My question comes from Motion in a Plane with Constant Acceleration topic in portion Motion in a Plane of Physics – Class 11

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The correct answer is (a) 0.7ĵ

To explain I would say: The acceleration of a body is the rate at which the velocity changes with time. Here, the change in velocity is 7ĵ. The total time taken is 10s. Hence, the acceleration = change in velocity/time = 0.7ĵ.

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