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

Answer:

2 oscillations in 5 s hence 1 oscillation in 2.5 s which is its time period

T=2πgl

2.5=2πgl

l=10×4π26.25=1.58m