The time T it takes for a pendulum to complete one full swing is given by where

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The time T it takes for a pendulum to complete one full swing is given by
L. T= 21,

where g is the acceleration due to gravity and L is the length of the pendulum. If g can be measured with a maximum error of 1%, how accurately must L be measured (in terms of percentage error) so that the calculated value of T has a maximum error of 2%?

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