Posted by **Tom** on Sunday, December 19, 2010 at 2:06pm.

A car of mass 1979 kg drives over a semicircular hilltop of radius 12.6 m and through a semicircular valley of radius 17.2 m with a constant velocity of 7.28 m/s.

What is the normal force on the car at the bottom of the valley?

would i use the equation mv^2/r +mg ?

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