Amass m = 550 g is hung from a spring with spring constant k = 2.8 n/m and set into oscillation at time t = 0. a second, identical mass and spring next to the first set is also set into motion. at what time t should the second system be set into motion so that the phase difference in oscillations between the two systems is pi/2?

The second system must be set in motion seconds later

Explanation:

The oscillation time, T, for a mass, m, attached to spring with Hooke's constant, k, is:

One oscillation takes T secondes, and that is equivalent to a 2π phase. Then, a difference phase of π/2=2π/4, is equivalent to a time t=T/4.

If the phase difference π/2 of the second system relative to the first oscillator. The second system must be set in motion seconds later