Answer:
(a) 16 ft/s
(b) 1.5 s
Explanation:
(a) Put 1 where t is in the expression and do the arithmetic:
-32×1 +48 = 16 . . . . feet per second
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(b) Use the hint and solve for t:
-32t +48 = 0
t -1.5 = 0 . . . . . divide by 32
t = 1.5 . . . . . . . . add 1.5
The ball reaches its maximum height after 1.5 seconds.