A roller-coaster car has a mass of 500 kg when fully loaded with passengers. At the bottom of a circular dip of radius 40 m (as shown in the figure) the car has a speed of 16 m/s. What is the magnitude of the force of the track on the car at the bottom of the dip?
a.
3.2 kN
b.
8.1 kN
c.
4.9 kN
d.
1.7 kN
e.
5.3 kN
b
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