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What must the hoop's radius be (in meters) ?

and

An object is undergoing SHM with period 0.260 s and amplitude 5.55 cm. At t=0 the object is instantaneously at rest at x= 5.55 cm.

Calculate the time it takes the object to go from x= 5.55 cm to x= -1.55 cm.

SOMEONE HELP ME