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**r(t)**= x

**+ y**

*i***+ z**

*j***,we can find its velocity**

*k***v(t)**by determining dy/dx of

**r(t)**and even go further to computing the speed v given by the magnitude of

**v(t)**.

With that being the case. If the magnitude of the speed v is defined, what would its magnitude be, and what would we call it ?