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In travelling wave, a particle posseses maximum velocity when it passes through the mean position and hence the kinetic energy is maximum at mean position while the displacement of the particle is minimum at mean position and hence potential energy would be minimum at mean position. At extreme position velocity of particle would become zero and displacement becomes maximum and hence at extreme positions kinetic energy is zero and potential energy is maximum. Same concept is applicable for standing wave as the particle between node and antinode in standing wave performs SHM.

A-  P,S

B- Q,R

C- P,S

D- Q,R