An Object Is Dropped from a Helicopter $60 \mathrm{ft} / \mathrm{s}$

An object is dropped from a helicopter. After 2 seconds, the speed of the object was $60 \mathrm{ft} / \mathrm{s}$ , and after 3.2 seconds, its speed had increased to $108 \mathrm{ft} / \mathrm{s}$ .
A. Find a linear equation that calculates the object's speed $y$ after $x$ seconds.
B. What is the speed of the object after 5 seconds?

A) a) $y=34 x$ ,
b) $170 \mathrm{ft} / \mathrm{s}$

B) a) $y=40 x$ ,
b) $200 \mathrm{ft} / \mathrm{s}$

C) a) $y=38 x$ ,
b) $190 \mathrm{ft} / \mathrm{s}$

D) a) $y=42 x$ ,
b) $210 \mathrm{ft} / \mathrm{s}$