(a) Two identical sinusoidal pulses move in opposite directions on a stretched string. Kinetic energy of each pulse is k. At the instant they overlap completely, what is kinetic energy of the resulting pulse?

(b) “A string clamped at both ends is vibrating. At the moment the string looks flat, the instantaneous transverse velocity of points along the string, excluding its end-points, must be same everywhere except at nodes.” Is this statement correct?

Answer

(a) 4 k
(b) No