physics

A small ball is set in horizontal motion by rolling it with a speed of 3.00 m/s across a room 12.0m long, between two walls. Assume that the collisions made with each wall are perfectly elastic and that the motion is perpendicular to the two walls. (a)Show that the motion is perpendicular, and determine its period. (B) Is this motion simple harmonic? explain

The motion is not harmonic, as the velocity is constant, and acceleration for most of the time is zero.

Period? How long does it take to travel 12 m? That is one half the period, right/

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