Question

A simple pendulum.Takes 1 sec to reach one extreme position what is the length of string

Answer 1

To reach one extreme position from the mean position, the time taken is: T/4, where T is the total time period.

So, T = 4s.

Now, we know, T = $2\pi\sqrt{\frac{l}{g}}$.

Putting in the values of T and g, we get:

$l = 3.975m$ (approximately 4m)

Note that the language of the question is incomplete. If it was meant that the time taken by the pendulum to reach the other extreme position from one, the time elapsed would be T/2, and hence, the value of length would be 0.9939m, approximately 1m.