Answer :

Statement (a) is correct because the equation of special relativity is only applicable when the speed of object is comparable to the speed of light. Newton’s equations of motion are used for small speeds.

When the body is travelling with the relativistic speed, then


, length becomes , change in time becomes where



Still the sum of the series will be greater than 0


Hence, non-relativistic equations in which γ factor is taken to be exactly 1 never give exact results.


Option (B) and (D) are correct

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