The radius vector of a point depends on time t, as
`r = c t +(b t^(2))/(2)`
where c and b are constant vectors. Find the modulus of velocity and acceleration at any time t.

Explanation

To solve the problem, we need to find the modulus of the velocity and acceleration of a point whose radius vector is given by:

\[ \mathbf{r} = \mathbf{c} t + \frac{1}{2} \mathbf{b} t^2 \]

where \(\mathbf{c}\) and \(\mathbf{b}\) are constant vectors.

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