A stunt pilot weighing 0.70 kN performs a vertical circular dive of radius 0.80 km. At the bottom of the dive, the pilot has a speed of 0.20 km/s which at that instant is not changing. What force does the plane exert on the pilot?
1) 3.6 kN up
2) 4.3 kN up
3) 2.9 kN down
4) 2.9 kN up
5) 5.8 kN down
Answer: 2