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sona1177

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## Homework Statement

If the speed of a roller coaster at the bottom of the loop is 25 m/s, what is the normal force exerted by the car by the track in terms of the car's weight mg?

## Homework Equations

N - mg =mv^2/r

## The Attempt at a Solution

N=mv^2/r + mg

N=m(v^2/r+ g)

N=m (31.25 + g)

My book says the answer is 4.2 mg. What did I do wrong?