Twp pulses in a stretched string whose centers are initially 8 cm aprt moving towards each other as shown in fig. The speed of each pulse is 2 cm /s. After 2 seconds, the total energy of the pulses will be :

Options

A. zero
B. purely potential
C. purely kinetic
D. partly kinetic x partly potenial .

Answer

C

Explanation

Distance covered by each pulse = 2`xx 2 `= 4 cm . Thus after 2 seconds the two pulses overlap each other.
Correct choice is (C).