Two symmetrical and identical pulses in a stretched string, whose centers 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 seconds, the total energy of the pulses will be:
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The two pulses are moving towards each other. The speed of each pulse is 
After 2 sec , one pulse moves to left by 4 cm and other pulse moves to right by 4 cm .
They superpose and annul the displacement of each other. The string will become straight
Hence there will be no potential energy
The total energy of the pulses will be kinetic
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