Two pulse in a stretched string whose ce...

Two pulse in a stretched string whose centers are initially `8cm` apart are moving towards each other as shown in the figure. The speed of each pulse is `2cm//s`. After `2seconds`, the total energy of the pulse will be

zero

purely kinetic

purely potential

partly kinetic and partly potential

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The correct Answer is:

After `2 s`, tubes will overlap each other. Accoding to superposition principle, the spring will not have any distortion and will be straight. Hence, there will be no `PE`. The total energy will be kinetic.

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