Can someone please help me with this I’ll give brainliest I need work too I don’t understand this

Problem 8  

a) Potential energy

b) Kinetic energy

c) PE initial + KE initial = PE final + KE final

d) speed = 12.52  m/s

Problem 9

The KE part should be completed with:

0 J

3750 J

7500 J

11250 J

15000 J

as shown below

Explanation:

Problem 8:

a) When the chunk of ice is at the top of the roof, it is NOT moving, and therefore its kinetic energy is ZERO, and all energy it has is potential energy (PE)

b) When it is at a fraction of an inch from the ground, The energy it has is basically Kinetic Energy (KE) due to its motion, and the potential energy is nearly zero because it distance from the ground is almost zero.

c) The conservation of energy formula stated that the total mechanical energy (given by the addition of potential energy (PE) plus the Kinetic Energy (KE) must be constant at any position of the falling chunk of ice cube in its movement downwards.

PE initial + KE initial = PE final + KE final

d) Using the equation above and the information given to us, we can estimate the speed of the ice chunk as it hits the ground:

PE initial + KE initial = PE final + KE final

(15 * g * 8) +   0   =   0    + 1/2  15  v^2

where v is the magnitude of the velocity of the chunk of ice as it hits the ground.

Solving for v:

v^2 = 2 * g * 8 = 156.8  m^2/s^2

v = 12.52  m/s

Problem 9:

We used the conservation of Total mechanical energy given above:

PE initial + KE initial = PE final + KE final  to obtain:

PE                KE

15000 J       0 J

11250 J        3750 J

7500 J        7500 J

3750 J        11250 J

0 J               15000 J

idk sorry i only needs point for apex

explanation:

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.