$\frac{m}{s}v(t)=20-10t.$

$(b)[4$ points$]$ Calculate the net distance $of$ the ball from $t=0tot=4.$

$(c)[1$ point$][Trueor$ False$]$ The total distance traveled $by$ the ball between

times $t=0$ and $t=4is$ given $by$

${\displaystyle \underset{0}{\overset{2}{}}}(20-10t)dt+{\displaystyle \underset{2}{\overset{4}{}}}(-20+10t)dt$