The metre rule was used as a cantilever to perform an oscillation experiment and the resulta shown below were obtained where ris time for 20 oscillations and I is the length of the oscillation portion of the cantilever 4.90 40.00 6.63 50.00 8.25 60.00 8.94 70.00 10.88 80.00 [11.83 90.00 L(cm) (a) If the relation between the period T and 2 is given by 7, determine the valor of B and state its S. I. unit (h) Calculate the standard error in​