Answer :


The length of the simple pendulum= 90 cm


The radius of bob and hook = 2.13 cm


Actual effective length of the pendulum = (90.0 + 2.13) cm
However, in the measurement 90.0 cm, the number of significant digits is only two.
So, the effective length should contain only two significant digits.
i.e., effective length = 90.0 + 2.13 = 92.1 cm.


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