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## Homework Statement

Find the curvature of r(t)=2ti+2tj+k.

## Homework Equations

None.

## The Attempt at a Solution

The answer is 0 in the book.

I know the formula for curvature is k(t)=abs(r'(t)xr"(t))/abs(r'(t))^3. I know that r'(t)=2i+2j and r"(t)=0, so r'(t)xr"(t)=0? How to find r'(t)xr"(t) and r'(t)^3?