JEE Main Physics question

Physics Motion in a Straight Line JEE Main

For a moving body, at any instant of time [NTSE 1995, DCE 2006]

(A)If the body is not moving, the acceleration is necessarily zero
(B)If the body is slowing, the retardation is negativeCorrect
(C)If the body is slowing, the distance is negative
(D)If displacement, velocity and acceleration at that instant are known, we can find the displacement at any given time in future

Answer: (B)

Solution

(A) is false (e.g. a ball momentarily at rest at its highest point still has ). (C) is false (distance is never negative). (D) is false in general (only valid for

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Question ID VK-152230