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## Homework Statement

How does one get the r" equation from r'?

## Homework Equations

r = distance

v = r' = ds/dt

a = r'' = dv/dt

chain rule, dy/dt = dy/dx * dx/dt

## The Attempt at a Solution

I can easily get to r' from r using the chain rule but how do you derive r" from r'? How do you apply the chain rule when there are 3 variables (sec theta, tan theta and theta dot)?

Help would be appreciated.