If a train going 80 m/min hits the
brakes, and it takes the train 2.5
seconds to stop, what is the
train's acceleration?

-0.53 m/s²

Explanation:

Acceleration is the change in velocity over change in time.

a = Δv / Δt

First, convert m/min to m/s.

80 m/min × (1 min / 60 s) = 1.33 m/s

a = (0 m/s − 1.33 m/s) / 2.5 s

a = -0.53 m/s²

answer: a) y=-8x+5

a) m= -8

b) m= -2

c) m= 7

d) m= 6

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.