48. A 5000-kg truck is turning on a flat road with a radius of 50 m. The road surface iswet and the coefficient of static friction μs = 0.4. Above what speed the truck willskid on the road? (g =10 m/s2).
(A)40 km/h
(B)50 km/h
(C)60 km/h
(D)70 km/h
(E)80 km/h