All I know is that 5 is melanin
Answer:
4) C.mass
5) C. Potential Energy
Explanation:
4) Kinetic energy (KE) of an object is the energy that it possesses due to its motion. If a mass is in motion ,it has a kinetic energy .
By definition

what matters in Kinetic energy is the mass and the velocity only .
there fore the answer is
C.mass
5) Potential energy is the energy stored in an object, due to the object's position or arrangement.
By definition

in potential energy the height matters.higher the height , higher the energy
therefore the answer is
C.Potential Energy
There is 0 acceleration because the pony is moving at a constant velocity
Answer:

Explanation:
We have given mass m=0.155 kg
Force constant K = 305 N/m
Distance 
Velocity 
The total energy at any position of the motion is give by
here
is energy due to motion and
is energy due to spring elongation
So total energy 
'A' and 'C' talk about energy being created and destroyed. That can't happen.
'D' trailed off in the middle, and we don't know WHAT it was talking about.
'B' is the only correct statement.