A car in an amusement park ride rolls without friction around the track. It starts from rest at point A at a height h above the bottom of the loop. Treat car as particle a) what is the minimum (in terms of R) such that the car moves around the loop without falling off at the top? b) If h=3.5R and r=20m, calculate the speed, radial acceleration, and tangential acceleration of the passengers when the car has gone 3/4 around the loop, which is at the end of a horizontal diameter.