Suppose the Distance $s$ (In Feet) Covered by a Car Moving Along a Straight

Multiple Choice

Suppose the distance $s$ (in feet) covered by a car moving along a straight road after $t$ sec is given by the function $s = f ( t ) = 3 t ^ { 2 } + 13 t$ . Calculate the (instantaneous) velocity of the car when $t = 35$ .

A) $223 \mathrm { ft } / \mathrm { sec }$
B) $16 \mathrm { ft } / \mathrm { sec }$
C) $560 \mathrm { ft } / \mathrm { sec }$
D) $4130 \mathrm { ft } / \mathrm { sec }$