Explanation
After 2 sec the pulses will overlap completely. The string becomes straight and therefore does not have any potential energy and its entire energy must be kinetic.
When pulse is reflected from a rigid support, the pulse is inverted both lengthwise and sidewise.
In case of sound wave, y can represent pressure and displacement, while in case of an electromagnetic wave it represents electric and magnetic fields.
(In general y is any general physical quantity which is made to oscillate at one place and these oscillations arc propagated to other places also).
Standing waves can be produced only when two similar type of waves (same frequency and speed, but amplitude may be different) travel in opposite directions.
At open end phase of pressure wave charge by π it so compression returns as rarefraction. While at closed end phase of pressure wave does not change so compression return as compression.
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