Solve the Problem $30 \mathrm { mph }$ With a Surface Area Of

Multiple Choice

Solve the problem. Round to the nearest tenth unless indicated otherwise.
-Wind resistance or atmospheric drag tends to slow down moving objects. Atmospheric drag varies jointly as an object's surface area A and velocity v. If a car traveling at a speed of $30 \mathrm { mph }$ with a surface area of $31 \mathrm { ft } ^ { 2 }$ experiences a drag of $130.2 \mathrm {~N}$ (Newtons) , how fast must a car with $50 \mathrm { ft } ^ { 2 }$ of surface area travel in order to experience a drag force of $525 \mathrm {~N}$ ?

A) $75 \mathrm { mph }$
B) $77 \mathrm { mph }$
C) $72 \mathrm { mph }$
D) $80 \mathrm { mph }$