EM-171

Substitution

E Math · Secondary 3 · Medium · Substitution

A pendulum has period given by

T = 2\pi\sqrt{\dfrac{L}{g}}

, where

L

is its length and

g = 9.8\,\text{m s}^{-2}

. Find the period when

L = 1.25\,\text{m}

.

$2.24\,\text{s}$
$0.81\,\text{s}$
$7.85\,\text{s}$
$0.23\,\text{s}$

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