JEE (Advanced) 2015 Paper-2 Question 2

Question 2

The energy of a system as a function of time t is given as $$E(t)= A^2 exp(-\alpha t),$$ where $$\alpha = 0.2 s^{-1}.$$ The measurement of A has an error of 1.25%. If the error in the measurement of time is 1.50%, the percentage error in the value of E(t) at t = 5 s is

Correct Answer: 4

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