Why does destructive interference occur when the two pulses overlap instead of constructive interference?

It happens when the maximum of the waves are 180 degrees out of phase. It is based on the superposition principle.

This is what i found on google “kinetic energy. energy is transferred from one object to another when a reaction takes place. energy comes in many forms and can be transferred from one object to another as heat, light, or motion, to name a few. this energy would be in the form of motion, with the person lifting the blue ball to a higher level.” i hope this you