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Solve the Problem tt Seconds Is s=128t16t2s = 128 t - 16 t ^ { 2 }

Question 171

Multiple Choice

Solve the problem.
-A ball is thrown vertically upward with an initial velocity of 128 feet per second. The distance in feet of the ball from the ground after tt seconds is s=128t16t2s = 128 t - 16 t ^ { 2 } . For what intervals of time is the ball less than 240 above the ground (after it is tossed until it returns to the ground) ?


A) between 0 and 3 seconds and between 5 and 8 seconds
B) between 3 and 5 seconds
C) between 0 and 2.52.5 seconds and between 5.55.5 and 8 seconds
D) between 0 and 3.53.5 seconds and between 4.54.5 and 8 seconds

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