5. A pendulum completes 2 oscillations in 5 s.
(a) What is its time period ? (b) If g = 9.8 m s. find
its length
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2 oscillations in 5 s hence 1 oscillation in 2.5 s which is its time period
T=2π √l/g
2.5=2π√l/g
l=10×6.25/4π^2 =1.58m
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