Answer: 20.765 m/s
Explanation:
This problem can be solved by the conservation of energy principle, this means the initial energy 
must be equal to the final energy 
:
(1)
Where each energy is the sum of kinetic energy 
and potential energy 
:
(2)
Where:
Being 
your mass and 
your initial velocity, since the roller coaster sterted from rest.
Being 
the acceleration due gravity and 
your initial height
Being 
your final velocity
Being 
your final height
Rewritting (2):
(3)
(4)
Isolating :
(5)
(6)
Finally:
This is your spedd when you arrive at 3 m height
Answer:
it's because some versions have more steps and others have less
The answer is chloroplasts.
The mass of an object and how rough the surface is
