Question

A pendulum completes 2 oscillations in 5 s.
(a) What is its time period ? (b) If g = 9.8 m s. find
its length​

Answer 1

frequency is equals to oscillation per unit time period

so frequency is equals to 0.4 heartz

ringtone creed is the reciprocal of frequency

T = 5/2 second

T=2π√l/√g