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The position of a body, moving in a plane, changes from origin to 14î + 11ĵ in 20s. What is the velocity of the body?

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The position of a body, moving in a plane, changes from origin to 14î + 11ĵ in 20s. What is the velocity of the body?

(a) 0.7î + 0.55ĵ

(b) 0.55î + 0.7ĵ

(c) 0.3î + 0.7ĵ

(d) 0.3î

I got this question in an internship interview.

This intriguing question originated from Motion in a Plane with Constant Acceleration in section Motion in a Plane of Physics – Class 11

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The correct choice is (a) 0.7î + 0.55ĵ

For explanation: The velocity of a body is the rate at which the displacement changes with time. Here, the change in position is the change in displacement, and is 14î + 11ĵ. The total time taken is 20s. Hence, the acceleration = change in displacement/time = 0.7î + 0.55ĵ.

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