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Q.

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 seconds, the total energy of the pulses will be

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a

Zero

b

Purely potential

c

Partly kinetic and partly potential

d

Purely kinetic

answer is B.

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Detailed Solution

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After 2 sec the pulses will overlap completely. The string becomes straight and therefore does not have any potential energy and its entire energy must be kinetic

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