4. A body with an initial velocity of 8 m/s moves with a constant acceleration and travels 640m in 40 seconds. What is the acceleration of the body?

a= 9.81 s

Explanation:

vi= 8m/s

a= -9.81 m/s

d= 640m

t= 40s

1. Find final velocity

vf= vi +a(t)

vf= 8m/s + -9.81m/s x 40s

vf = -384.4 m/s

acceleration= change in velocity/ change in time

a= -384.4- 8= -392.4/ 40s = 9.81s

a= 9.81 m/s

Hopefully this helps and is correct! Much love ❤️

the answer to this question is 60 n

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.