Two particles execute SHM of the same amplitude and frequency on parallel side by side. They cross each another when moving in opposite directions each time their displacement is half their amplitude What is the difference between them ?

Answer

`120^@ ` or `2pi//3 ` radian

Explanation

`y_1 = A sin omegat and `
`y_2 = A "in" (omega t + phi) , y_1 + y_2 = A//2`
From this `phi = (2pi //3)` radian