21. A balloon is rising vertically above a level, straight road at a constant rate of 0.3 m/s. Just when the balloon is 20 m above the ground, a bicycle moving at a constant rate of 5 m/s passes under it. How fast is the distance s(t) between the bicycle and balloon increasing 3 s later? A light the top of a pole 15 llis me the ball falls a dis... e ground 1/2 s(r) x(()

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