May I have an explanation pls

A Ferris wheel is a vertical, circular amusement ride with radius 8 m. Riders sit on seats that swivel to remain horizontal. The Ferris wheel rotates at a constant rate, going around once in 7 s. Consider a rider whose mass is 54 kg. At the bottom of the ride, what is the rate of change of the rider's momentum? tol 347i kg . m/s/s At the bottom of the ride, what is the vector gravitational force exerted by the Earth on the rider? Fgrav = -495.7i Z X At the bottom of the ride, what is the vector force exerted by the seat on the rider? 842j Z X Next consider the situation at the top of the ride. At the top of the ride, what is the rate of change of the rider's momentum? -347i kg . m/s/s At the top of the ride, what is the vector gravitational force exerted by the Earth on the rider? -496j Z X At the top of the ride, what is the vector force exerted by the seat on the rider? Fby seat = 148j Z X n). A rider feels lighter