Question: Lets say we are given a function: s(t) = te^-t/2 s = feet and t= second When is the particle speeding up? And when is

Lets say we are given a function: s(t) = te^-t/2 s = feet and t= second When is the particle speeding up? And when is it slowing down? How can I solve this problem?? And what do I do if the interval isn't defined, just like the question above

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