Determine the Constant of Variation for the Stated Condition

Determine the constant of variation for the stated condition.
-While traveling in a car, the centrifugal force a passenger experiences as the car drives in a circle varies jointly as the mass of the passenger and the square of the speed of the car. If a passenger experiences a force of 57.6 newtons when the car is moving at a speed of 40 kilometers per hour and the passenger has a mass of 40 kilograms, find the force a passenger experiences when the car is moving at 30 kilometers per hour and the passenger has a mass of 70 kilograms.

A) 56.7 newtons
B) 63 newtons
C) 50.4 newtons
D) 72 newtons