A Ball Is Thrown Straight Down from the Top of a 300-Ft

Multiple Choice

A ball is thrown straight down from the top of a 300-ft building with an initial velocity of $- 12 \mathrm { ft }$ per second. The position function is $s ( t ) = - 16 t ^ { 2 } + v _ { 0 } t + s _ { 0 }$ . What is the velocity of the ball after 4 seconds?

A) The velocity after 4 seconds is $- 76 \mathrm { ft }$ per second.
B) The velocity after 4 seconds is $- 116 \mathrm { ft }$ per second.
C) The velocity after 4 seconds is $- 140 \mathrm { ft }$ per second.
D) The velocity after 4 seconds is $- 52 \mathrm { ft }$ per second.
E) The velocity after 4 seconds is $- 280 \mathrm { ft }$ per second.