I'm having trouble with this problem I was wondering if someone could help me out. If r(t) is not equal to zero, show that (d/dt)|r(t)| = 1/|r(t)|r(t)*r'(t)
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Originally Posted by Todeezy I'm having trouble with this problem I was wondering if someone could help me out. If r(t) is not equal to zero, show that (d/dt)|r(t)| = 1/|r(t)|r(t)*r'(t) Notice that the derivative of the inner function is just the dot product of the vector and its derivative.
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