Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
Solve the problem.
-If an object is thrown straight upward from the ground with an initial speed of 112 feet per second, then its height, $h$ , in feet after $t$ seconds is given by the equation $h ( t ) = - 16 t ^ { 2 } + 112 t$ . Find the instantaneous speed of the object at $t = 6$

A) $112 \mathrm { ft } / \mathrm { sec }$
B) $- 464 \mathrm { ft } / \mathrm { sec }$
C) $- 80 \mathrm { ft } / \mathrm { sec }$
D) $16 \mathrm { ft } / \mathrm { sec }$