An aeroplane flying in the sky with a uniform speed of 200 m/s moves in a vertical circle of radius 400 m. The mass of the pilot is 70 kg. The force exerted by the pilot on the seat at the highest point of the circle will be [Take g = 10 m/s2]
(A) 3000 N
(B) 6300 N
(C) 7700 N
(D) 630 N