5. A cart with one fan on it blowing to the left and carrying one block produces the x vs t graph shown. If this cart were carrying three blocks instead of one, with the fan still blowing the same direction, what could the x vs t graph look like?

maybe because its impossible for balloons to lift a whole entire house.

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.