A student measures the distance traversed in free fall of a body , initially at rest in a given time. He uses this data to estimate g , the acceleration due to gravity. If the maximum percentage errors in measurement of the distance and the time are e1 and e2 respectively , the percentage error in the estimation of g is
(1) e2-e1
(2) e1+2e2
(3) e1+e2
(4) e1-2e2
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