



 
Hi Yen, if the variable $s$ is displacement and $t$ is time, which I expect they are then you know that \[\frac{ds}{dt} = v(t) \mbox{ and } \frac{dv}{dt} = a(t)\] where $v(t)$ is velocity at time $t$ and $a(t)$ is the acceleration at tome $t.$ Penny 



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