Physics-
General
Easy
Question
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
- Zero
- Purely kinetic
- Purely potential
- Partly kinetic and partly potential
The correct answer is: Purely kinetic
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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