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21.2 A box of mass m=6.5 kg on a frictionless incline of angle 0 = 30 is connected, by a cord that runs over a (frictionless and massless) pulley, to a spring of spring constant k = 180 N/m, as shown in the figure. The box is released from rest when the spring is unstretched. What is the speed v of the box when it has moved a distance d=0.15m down the incline? (A) 0.48 m/s (B) 1.14 m/s (C) 0.92 m/s (D) 0.84 m/s (E) 0.65 m/s