22. A light shines from the top of a pole 15 m high. A ball is dropped from the same height from a point 9 m away from the light. (See accompanying figure.) How fast is the shadow of the ball moving along the ground 1/2 s later? (Assume the ball falls a distance s = 4.9t² m in t seconds.) 15 m pole Light 0 9 Ball at time=0 1/2 s later Shadow x(1) X SUO

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