When the motorcyclist is at A, he increases his speed along the vertical circular path at the rate of v̇ = (0.04s) ft/s², where s is in ft and s = 0 at A. If he starts at v_A = 2 ft/s, determine the magnitude of his velocity when he reaches B. Also, what is his initial acceleration?

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A 300 ft 60° 300 ft в