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Question Number 64456 by ner0i last updated on 18/Jul/19

Commented by Tony Lin last updated on 18/Jul/19

r^⇀ ′(t)=i^� −(2/t^2 )j^� −(1/t^2 )k^�   r^⇀ ′′(t)=(4/t^3 )j^� −(2/t^3 )k^�

$$\overset{\rightharpoonup} {{r}}'\left({t}\right)=\hat {{i}}−\frac{\mathrm{2}}{{t}^{\mathrm{2}} }\hat {{j}}−\frac{\mathrm{1}}{{t}^{\mathrm{2}} }\hat {{k}} \\ $$$$\overset{\rightharpoonup} {{r}}''\left({t}\right)=\frac{\mathrm{4}}{{t}^{\mathrm{3}} }\hat {{j}}−\frac{\mathrm{2}}{{t}^{\mathrm{3}} }\hat {{k}} \\ $$

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