Physics

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A roller-coaster car has a mass of 1170 kg when fully loaded with passengers. As the car passes over the top of a circular hill of radius 16 m, its speed is not changing.
(a) What are the magnitude and direction of the force of the track on the car at the top of the hill if the car's speed is 11 m/s?
______N

upward
downward
no force

(b) What are the magnitude and direction of the force of the track on the car at the top of the hill if the car's speed is 17 m/s?
_________N
upward
downward
no force

• Physics -

force on track=mg-mv^2/r

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