Fromt $=0$ tot $=3\mathrm{.}61$ min, a man stands still, and from t $=3\mathrm{.}61$ min to t $=7\mathrm{.}22$ min, he walks briskly in a straight

line at a constant speed of $2\mathrm{.}81$ m$/$s$.$ What are $($a$)$ his average velocity Vavg and $($b$)$ his average acceleration davg in

the time interval $1\mathrm{.}00$ min to $4\mathrm{.}61$ min? What are $($c$)$ Vavg and $($d$)$ davg in the time interval $2\mathrm{.}00$ min to $5\mathrm{.}61$ min?