The displacement S in meters of an object thrown upward is a function of time t in seconds such that S(t) = -4.9t2 + 19.6t. At what times that the object is 14.7 meters above its starting point? Select one: a. t = 2 sec and t = 3 sec O b. t D2 sec and t = 4 sec c. t = 1 sec and t = 3 sec

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