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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 s, the total energy of the pulses will be(a) zero (b) purely kinetic (c) purely potential (d) partly kinetic and partly potential |
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Answer» Correct Answer is: (b) purely kinetic After 2 s, 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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