Solve the Problem. -The Grade Resistance F of a Car Traveling Up or Traveling

Solve the problem.
-The grade resistance F of a car traveling up or down a hill is modeled by the equation F = W sin ϴ where W is the weight of the car and ϴ is the angle of the hill's grade (ϴ > 0 for uphill travel, ϴ < 0
For downhill travel) . A 2025-lb car has just rolled off a sheer vertical cliff (ϴ = -90°) . What is the
Car's grade resistance?

A) undefined
B) 0 lb
C) -2025 lb
D) 2025 lb