Two 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 [2001]

Question

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(2)

The speed of each pulse is 2 cm/s and initially two pulses are 8 cm apart and moving towards each other.

After two seconds pulses will overlap each other.

According to the superposition principle the string will not have any distortion and will be straight.

Hence there will be no P.E. The total energy will be only kinetic.

Solution

Q.
Two 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 [2001]

1 zero

2 purely kinetic

3 purely potential

4 partly kinetic and partly potential

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