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

purely potential

partly kinetic and partly potential

zero

purely kinetic

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The correct Answer is:

Two pulses are travelling towards each other.

After 2s, each pulse will travel a distance `2xx2 = 4cm` and they will meet in mutually opposite phases and the amplitude of the resultant wave becomes zero. Hence the string will become straight. Hence its P.E.= 0. It has only K.E.

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