A mass of 0.274 kg is attached to the endof a massless spring of unknown spring constant. The mass isdropped from rest at point A, with the spring initiallyunstretched. As the mass falls, the spring stretches. At point Bthe mass is as shown in the figure below, where v =4.80 m/s.

(a) Find the force constant of the spring.

(b) Find the magnitude of the acceleration of the mass at pointB.
2 m/s2

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