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A brick is resting atop a piston that is moving vertically with simple harmonic motion of period 1.19 s. At what amplitude will the brick separate from the piston?

I know that once the acceleration is greater than that of gravity the 2 will seperate.

I tried using the equation:

a(t)=-w^2Acos(wt+phi) a=-9.8 w=2pi/T phi=pi and t=T

Where am I wrong on this question?

Any help would be greatly appreciated! Thanks

Peter