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Physics-

General

Easy

Question

A smooth track is shown in figure. A part of track is a circle of radius R. A block of mass m is pushed against a spring of constant k fixed at the left end and is then released. The initial compression of the spring so that the block presses the track with a force mg when it reaches the point P of the track, where R is radius of the track :

$\sqrt{\frac{m g R}{3 k}}$
$\sqrt{\frac{3 g R}{m k}}$
$\sqrt{\frac{3 m g R}{k}}$
$\sqrt{\frac{3 m g}{k r}}$

The correct answer is: $square root of fraction numerator 3 m g R over denominator k end fraction end root$

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