STANDARD Physics Newton's Second Law MCQ Question
A body of mass 5 kg starts from the origin with an initial velocity u = (30î + 40ĵ) m s⁻¹. If a constant force (-6î - 5ĵ) N acts on the body, the time in which the y-component of the velocity becomes zero is
5 s
20 s
40 s
80 s
Correct Answer
Detailed Explanation
The force causes a deceleration in the y-direction of 1 m s⁻². Using v = u + at, where v = 0, u = 40 m s⁻¹, and a = -1 m s⁻², we find t = 40 s.
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