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The oscillation of the 2.0-kg mass on a spring is described by x = 3.0 cos (4.0 t) where x is in centimeters and t is in seconds. What is the force constant k of the spring?

The oscillation of the 20kg mass on a spring is described by x 30 cos 40 t where x is in centimeters and t is in seconds What is the force constant k of the spr class=