Posted by **Anonymous** on Friday, February 26, 2010 at 7:04pm.

A roller-coaster car speeds down a hill past point A where R1 = 8.0 m and then rolls up a hill past point B where R2 = 14.0 m.

The car has a speed of 21.0 m/s at point A. if the track exerts a normal force on the car of 2.19 multiplied by 104 N at this point, what is the mass of the car?

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**bobpursley**, Friday, February 26, 2010 at 7:31pm
I don't understand what R1 and R2 are. Are they heights?

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**Anonymous**, Sunday, December 11, 2011 at 10:50pm
fdh

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**Mateo**, Tuesday, November 18, 2014 at 5:03pm
R1 and R2 are both the radius of the circles at the bottom and top respectively. I don't know the answer, I'm looking into that as well. At least you know that it's a radius now! :D

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