Why do you feel that you are being thrown upward out of your seat when going over an upward arced hump on a roller coaster?
(a) There is an additional force lifting up on you.
(b) At the top you continue going straight and the seat moves out from under you.
(c) You press on the seat less than when the coaster is at rest. Thus the seat presses less on you.
(d) Both b and c are correct.
(e) a, b, and c are correct.
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