Part A Q$10$

The position of a particular particle as a function of i$$me is given by vec$(r)=(9\mathrm{.}60t*(hat(i))+8\mathrm{.}85(hat(j))-1\mathrm{.}00t^2*(hat(k)))m,$ where $t$ is in seconds.

What is the average velocity of the particle between $t=1\mathrm{.}00s$ and $t=3\mathrm{.}00s?$

Express your answer in terms of the unit vectors hat$(i),$hat$(j),$ and hat$(k).$

$\sqrt[]{1}Ah0?$

vec$(v{)}_{\text{a}\text{v}\text{g}}=$

$\frac{m}{s}$

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Part B

What is the magnitude of the instantaneous velocity at $4\mathrm{.}00s?$