A roller-coaster car has a mass of 509 kg when fully loaded with passengers. http://www.webassign.net/pse/p6-21.gif (a) If the vehicle has a speed of…

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A roller-coaster car has a mass of 509 kg when fully loaded with passengers.
http://www.webassign.net/pse/p6-21.gif
(a) If the vehicle has a speed of 20.1 m/s at point A, what is the force exerted by the track on the car at this point?
??? N
(b) What is the maximum speed the vehicle can have at B and still remain on the track?
???/ m/s