Question 6 • AP Calculus AB - MA5186 A
Velocity is the rate of change of height, so differentiate h(t) = 56t − 16t² to get v(t) = 56 − 32t. At t = 2, v(2) = 56 − 32(2) = 56 − 64 = −8 feet per second. The correct choice is B, −8 ft/sec.
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