A150 kg object takes 90 seconds to travel a 2500 meter straight path. it begins the trip traveling 120 meters per second and decelerates to a velocity of 20 meters per second.
what was it's acceleration?

massxgravity x heght=weightxheight= pe

4900=490xh

h=10

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.

its a 5.5 n

glad that