+3 votes
in JEE by kratos

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/. After 2 , the total energy of the pulses will be

(a) zero

(b) purely kinetic

(c) purely potential

(d) partly kinetic and partly potential

1 Answer

+1 vote
by kratos
 
Best answer

Correct Answer is: (b) purely kinetic

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

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