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15sec

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The question is incorrect and so got a wrong answer. Acceleration cannot be measured in m sec but m sec-2. The previous answerer, assumed that the questioner had meant velocity, not acceleration. If the velocity had been 2 m sec-1 then the time would have been 15 seconds. But it was not even m sec-1! It seemed the units were wrong.

If you assume that acceleration = 2 m sec-2 then

t2 = 2s/a = 2*30/2 = 30

and so

t = sqrt(30) seconds = 5.48 seconds (approx)

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