I think your answer would be C. because they are replacing the trees they are cutting down.
The answer to your question is A.
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:
vitamins don't contain calories
C is the correct answer but the best possible answer is that work is done when a force is imposed on an object and the object moves in the same direction as the force
Hope this helps!
