A motorized scooter starts from rest and accelerates for 4 seconds at 2 m/s ^ 2. Calculate the avergae velocity of the scooter for the interval 0-4 seconds. Hint Find Vf then find the average in the normal way

Explanation:

Given

acceleration = 2m/s²

time = 4secs

initial velocity u = 0m/s (motor starts from rest)

Using the equation of motion v = u+at

v = 0+2(4)

v =0+8

v = 8m/s

Hence the final velocity of the car s 8m/s.

Average velocity = distance / time

S = ut + 1/2at²

S = 0+1/2(2)4²

S = 16m

If the distance covered is 16m

Average velocity = 16/4

Average velocity = 4m/s

the device is called “ rocket engine”

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.