A roller coaster car is loaded with passengers and has a mass of 500 kg along with a speed of 18 meters/second at the dip. the radius of curvature of the track at the bottom point of the dip is 12 meters (gravity = 9.8 meters/second2). what force is exerted on the roller coaster car by the track at the bottom of the dip? a. 1.6 × 104 newtons b. 1.8 × 104 newtons c. 0.5 × 104 newtons d. 1.0 × 104 newtons e. 8.6 × 103 newtons