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The height h in feet of a ball thrown upward at b feet per second
is
, where t is time in seconds and c is the
initial height in feet above the ground. If a ball is thrown upward
at 24 feet per second from an initial height of 40 feet, in how many
seconds will it hit the ground?
a) 1 sec. b) 1.5 sec. c) 2 sec. d) 2.5 sec. e) 3 sec.