A road is built to go up a hill. it is designed so antique cars can go up. the fastest such a car can go is from rest to 16 m/s in 10 seconds. the maximum slope angle is _____° between the road and horizontal. a road is built to go up a hill. it is designed so antique cars can go up. the fastest such a car can go is from rest to 16 m/s in 10 seconds. the maximum slope angle is _____° between the road and horizontal.