A1800-kg jeep travels along a straight 500-m portion of highway (from a to b) at a constant speed of 10 m/s. at b, the jeep encounters an unbanked curve of radius 50 m. the jeep follows the road from b to c traveling at a constant speed of 10 m/s while the direction of the jeep changes from east to south. what is the magnitude of the frictional force between the tires and the road as the jeep negotiates the curve from b to c?