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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

Partialy kinetic and partialy potential

Text Solution

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The correct Answer is:
B
After two seconds both the pulses will move 4 cm towards each other. So, by their superposition, the resultant displacement at every point will be zero. Therefore, total energy will be purely in the from of kinetic. Half of the particles will be moving upwards and half of downwards.
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