1. Jun 18, 2008

ritwik06

1. The problem statement, all variables and given/known data

The radius vector of a point depends on time t, as $$\vec{r}=\vec{c}t+\vec{b}\frac{t^{2}}{2}$$, where $$\vec{c}$$ and $$\vec{b}$$ are constant vectors. Find the modulus of velocity and acclereation at any time t.

3. The attempt at a solution
$$\vec{v}=\vec{c}+\vec{b}t$$

$$\vec{a}=\vec{b}$$

But how shall I find the modulus?

Last edited: Jun 18, 2008
2. Jun 18, 2008

Dick

The modulus of a vector v is the square root of v dot v.