1.

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 + 7ĵThe 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

Answer»

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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