user8899
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Homework Statement
The position function of a particle is given by r(t) = <2t, 3, -2t+1> where t is the time in seconds. When is the speed a minimum? What is the minimum speed?
Homework Equations
v(t) = r'(t)
The Attempt at a Solution
The derivative of r'(t) = 2 + 0 + (-2) = 0. The t is canceled out so how are we supposed to find t and the minimum speed? I am so confused. Help please?
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