A car of mass 1000 kg negotiates a banked curve of radius 90m on a frictionless road. If the banking angle is 45°, the speed of the car is :

5 m/s 10 m/s 20 m/s 30 m/s

30 m/s

v = \(\sqrt{Rg tan \theta}\) v = \(\sqrt{(90)(10)(tan45^0)}\) v = \(\sqrt{900}\) = 30 m/s