9. If the distance to electric train is given by Fr = a + bv + cv2 In this equation constant c is likely to cover
A. track resistance
B. air resistance
C. frictional resistance
D. flange resistance
9. If the distance to electric train is given by Fr = a + bv + cv2 In this equation constant c is likely to cover
A. track resistance
B. air resistance
C. frictional resistance
D. flange resistance