4. The roller coaster car having a mass of 100 kg is released from rest at point A. If the track is to be designed so that the car does not leave it at B, determine the required height h. Also, find the speed of the car when it reaches point C. Neglect friction. Note: At point B the car is about to leave the track. What would that mean for the normal force Na? B 7.5 m 20 m

4. The roller coaster car having a mass of 100 kg is released from rest at point A. If the track is to be designed so that the car does not leave it at B, determine the required height h. Also, find the speed of the car when it reaches point C. Neglect friction. Note: At point B the car is about to leave the track. What would that mean for the normal force Na? B 7.5 m 20 m