You are riding on a roller coaster that starts from rest at a height of 25.0 m and moves down a frictionless track to a height of 3.00 m. how fast are you moving when you arrive at the 3.00-m height? you are riding on a roller coaster that starts from rest at a height of 25.0 m and moves down a frictionless track to a height of 3.00 m. how fast are you moving when you arrive at the 3.00-m height? 20.8 m/s 14.7 m/s 22.1 m/s 23.4 m/s submitrequest answer part b you are riding on a roller coaster that starts from rest at a height of 25.0 m and moves along a frictionless track. how fast are you moving when you reach the top of the loop, at point b? you are riding on a roller coaster that starts from rest at a height of 25.0 m and moves along a frictionless track. how fast are you moving when you reach the top of the loop, at point b? 20.3 m/s 13.3 m/s 16.0 m/s 26.9 m/s submitrequest answer part c you are riding on a roller coaster that starts from rest at a height of 25.0 m and moves along a frictionless track. however, after a bad storm some leaves settled on part of the track causing a 9.4-m length of the track to exert a frictional force of 625 n on the car. to safely make it around the loop, the 50-kg car must have a minimum speed of 7.7 m/s at the top of the loop (point b). how fast should the car be moving initially at point a to ensure that it reaches the top of the loop with the minimum required speed?