Solve the Problem

Multiple Choice

Solve the problem. Round to the nearest tenth unless indicated otherwise.
-The force needed to keep a car from skidding on a curve varies jointly as the weight of the car and the square of the carʹs speed, and inversely as the radius of the curve. If a force of 3600 pounds is
Needed to keep an 1800 pound car traveling at 20 mph from skidding on a curve of radius 600 feet,
What force would be required to keep the same car from skidding on a curve of radius 660 feet at
40 mph? Round your answer to the nearest pound of force.

A) 12,959 lb
B) 13,123 lb
C) 13,091 lb
D) 13,661 lb