As the pulses interfere destructively there is a point in time when the string is perfectly straight. which of the following statements is true at this moment? a)the energy of the string is zero. b)the string is not moving either up or down. c)the string has only kinetic energy.

According to the statement we can deduce that the resulting amplitude of the wave pulse is zero when there is a destructive interference of two pulses and the chain is straight. At this point the potential energy will be zero, therefore when applying the energy conservation theorem, the potential energy must be equal to the kinetic energy and be conserved. The potential energy will be totally transferred as kinetic energy and therefore that will be the only energy present in the string.

Thus, the option C is correct.

b

explanation:

trig 15.3 cos