Physics

Problem

A block attached to a horizontal spring oscillates on a frictionless surface between positions

x=-A

and

x=+A

, where

x=0

is equilibrium. Rank the following positions in order of increasing kinetic energy of the block: I.

x=+A

II.

x=+\tfrac{A}{2}

while the block moves toward equilibrium III.

x=0

Which ranking is correct? a)

\text{III} < \text{II} < \text{I}

\text{I} < \text{II} < \text{III}

\text{II} < \text{III} < \text{I}

\text{I} < \text{III} < \text{II}