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Two pulses in a stretched string whose c...

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

A

zero

B

purely kinetic

C

purely potential

D

partly kinetic and partly potential

Text Solution

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The correct Answer is:
B
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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