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Answer 1 · 2017-02-27T10:55:41

The length is $=1m$

The period of a simple pendulum is

$T=2pisqrt(L/g)$

Period $=Ts$

Length $=L (m)$

Therefore,

$L/g=T/(4pi^2)$

In the first case, we have

$L=(Tg)/(4pi^2)=(4^2*9.8)/(4pi^2)=4m$

In the second case,

$T=60/30=2s$

So,

$L=(4*9.8)/(4pi^2)=1m$