SEE FIRST OF ALL IT IS IMPOSSIBLE TO TRAVEL AT THE SPEED OS LIGHT.IF A BODY HAS AN ACCELERATION OF 3*10^8 m/s^-2 THEN THIS MEANS THAT IF THE BODY STARTS FROM REST THEN IN ONE SECOND IT WILL ATTAIN THE SPEED OF LIGHT WHICH AS I SAID IS IMPOSSIBLE.
A body can posses acceleration energy can not. so if a body have an acc of 3*108 ms-2, then it will convert into energy after 1 sec. So the acc will be possesed for T second when,
T = [t ][ 1-] t
So it is possible to have that acc for a short time. Hope this made ur answer clear
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Mass = m at rest / square root of [ 1 - v^2 / c^2] if v Approximately equal to c then m = infinite and to propell an object of infinite mass u will need infinite force and this much force does not exist in the entire universe.....
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if u had a clear knowledge abt add., of velocities & relativity.u won't get this dbt.but there is possibility of vel., being greater than vel., of light in case of sound,its recent discovery,somewhere i studied in newspaper.