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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

Verified by Experts

The correct Answer is:
B
The two pulses are moving towards each other.
The speed of each pulse is 2 cm/s.
`therefore` After 2 sec, one pulse moves to left by 4 cm and other pulse moves to right by 4 cm.
`therefore` They superpose and annul the displacement of each other. The string will become straight.
Hence there will be no potential energy.
`therefore` The total energy of the pulses will be kinetic.
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