Motion and force along a curved path

[a18c18]

Homework Statement

A car speeds along the curved exit ramp of a freeway. The radius of the curve is 82 m. A 76 kg passenger holds the arm rest of a car door with a 220 N force to keep from sliding across the front seat of the car. (Assume the exit ramp is not banked and ignore friction with the car seat.) What is the car's speed?

Homework Equations

v=2(3.14)r/t
u(static)=v^2/rg

The Attempt at a Solution

I tried to use the v=2(3.14)r/t formula but I don't know the time. I'm not sure what else to try.

 

[LowlyPion]

Homework Statement

A car speeds along the curved exit ramp of a freeway. The radius of the curve is 82 m. A 76 kg passenger holds the arm rest of a car door with a 220 N force to keep from sliding across the front seat of the car. (Assume the exit ramp is not banked and ignore friction with the car seat.) What is the car's speed?

Homework Equations

v=2(3.14)r/t
u(static)=v^2/rg

The Attempt at a Solution

I tried to use the v=2(3.14)r/t formula but I don't know the time. I'm not sure what else to try.

You would do better to work from the 220N force on the individual.

F=m*a since this is also equal to mV²/R you know that a = V²/R ... Calculate a. Calculate V.