SOLVE FOR C AND D PLZ

C$-$On the axes provided in figure $5$sketch a graph of the velocity of the block as a function of time

D$-$A student sketches the free body diagram in figure $6$and makes the following claim$-"$the free body diagram shows the forces exerted on the block at Time t$=1\mathrm{.}5$tsubscript$0."$Justify why the students sketch $($figure $6)$and claim are or are not consistent with the graph of velocity as a function of time you've sketched in part C