A Roller Coaster Traveling at 15 M/s Goes Through a Dip

Multiple Choice

A roller coaster traveling at 15 m/s goes through a dip in the track whose radius of curvature is 45 m. Assuming that the acceleration of gravity is 10 m/s², the number of "g's" the riders experience is

A) 1.5 g.
B) 0.50 g.
C) 5.0 g.
D) 6.0 g.