A rollercoaster car carrying a passenger of mass m m\,m travels around a vertical loop of radius rrr. At the top of the loop, the car has a speed vvv. For the passenger to remain in contact with their seat, there must be a non-zero normal contact force, meaning N≥0N \ge 0N≥0. Under the acceleration of free fall ggg, which statement is correct?
v2≥grv^2 \ge grv2≥gr
v≥grv \ge grv≥gr
v2≤grv^2 \le grv2≤gr
mv2≤grmv^2 \le grmv2≤gr
