A simple pendulum has time period T1. The point of suspension is now moved upward according to the relation y=kt2(k=1m/s2), where y is the vertical displacement. The time period now becomes T2. The ratio of T21T22 is
65
T1=2π√lg
T2=2π√Lg+a
a=d2ydt2=2k=2ms−2
T21T22=g+ag=10+210=65