Which is the exact amount of time when the velocity is 1 ft/sec?
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s ( t ) = 1 3 t − t 2 L e t s = 1 3 t − t 2 L e t V = v e l o c i t y V = d t d s = 1 3 − 2 t T o f i n d t h e t i m e , t , w h e n t h e v e l o c i t y i s 1 , 1 3 − 2 t = 1 − 2 t = − 1 2 t = 6 o r 6 s e c o n d s