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
IIT 2001, Medium
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(b) 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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