Q2 of 46 Page 457

If the speed of a rod moving at a relativistic speed parallel to its length is doubled,

If the speed of rod is relativistic speed then, its mas will be



And its length will be,



When speed v is doubled,





Hence, mass will be increased and it will be more than double. Length will decrease but not exactly half of the original length.


Option (C) and (D) are correct.

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