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#### Dhamnekar Winod

##### Active member

- Nov 17, 2018

- 103

Given $\vec{r}=t^m* \vec{A} +t^n*\vec{B}$ where $\vec{A}$ and $\vec{B}$ are constant vectors,

How to show that if $\vec{r}$ and $\frac{d^2\vec{r}}{dt^2}$ are parallel vectors , then

I don't have any idea to answer this question. If any member knows the answer to this question, may reply with correct answer to this thread.

How to show that if $\vec{r}$ and $\frac{d^2\vec{r}}{dt^2}$ are parallel vectors , then

**m+n=1,**unless**m=n?**I don't have any idea to answer this question. If any member knows the answer to this question, may reply with correct answer to this thread.

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