The position of the front bumper of a test car under microprocessor control is given by x1t2 = 2.17 m + 14.80 m> s 2 2t 2 - 10.100 m> s 6 2t 6 . (a) find its position and acceler- ation at the instants when the car has zero velocity.

an obstruction

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.