JEE MAIN - Physics (2019 - 9th January Evening Slot - No. 16)

A particle is executing simple harmonic motion (SHM) of amplitude A, along the x-axis, about x = 0. When its potential Energy (PE) equals kinetic energy (KE), the position of the particle will be :
$${A \over 2}$$
$${A \over {2\sqrt 2 }}$$
$${A \over {\sqrt 2 }}$$
A

Explanation

Total energy of particle = $${1 \over 2}k{A^2}$$

Potential energy (v) = $${1 \over 2}$$ kx2

Kinetic energy (K) = $${1 \over 2}$$ kA2 $$-$$ $${1 \over 2}$$kx2

According to the question,

Potential energy = Kinetic energy

$$ \therefore $$  $${1 \over 2}$$kx2 = $${1 \over 2}$$kA2 $$-$$ $${1 \over 2}$$ kx2

$$ \Rightarrow $$  kx2 = $${1 \over 2}$$ kA2

$$ \Rightarrow $$  x = $$ \pm $$ $${A \over {\sqrt 2 }}$$

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