Solve the problem.A coin is tossed upward from a balcony 390 ft high (h0) with an initial velocity (v0) of 
, according to the formula h(t) = -16t2 + v0t + h0, where t is time in seconds. During what interval of time will the coin be at a height of at least 70 ft?
A. 0 sec ? t ? 5 sec
B. 5 sec ? t ? 10 sec
C. 0 sec ? t ? 1 sec
D. 4 sec ? t ? 5 sec
Answer: A
Mathematics
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