As shown in the figure a block is resting on a frictionless floor and is attached to the free end of a spring. The right edge of the block in equilibrium is at a distance d from the wall. When the spring is compressed by a distance d / 2 and released, the time-period of the motion is T . Similarly, when compressed by a distance 2 d and released, the time-period is T₀ . Considering elastic collision between the block