Total mechanical energy: D) 2800 J
Explanation:
The total mechanical energy of an object is given by
![E=KE+PE](https://tex.z-dn.net/?f=E%3DKE%2BPE)
where:
is the kinetic energy of the object, which is the energy possessed by the object due to its motion, where
m = mass of the object
v = speed
And
is the gravitational potential energy of the object, the energy possessed by the object due to its location, where
is the acceleration due to gravity
h is the height of the object above the ground
For the body in this problem, we have:
m = 4.0 kg
v = 20 m/s
h = 50 m
Substituting, we find its total energy:
![E=\frac{1}{2}mv^2+mgh=\frac{1}{2}(4.0)(20)^2+(4.0)(9.8)(50)=2760 J \sim 2800 J](https://tex.z-dn.net/?f=E%3D%5Cfrac%7B1%7D%7B2%7Dmv%5E2%2Bmgh%3D%5Cfrac%7B1%7D%7B2%7D%284.0%29%2820%29%5E2%2B%284.0%29%289.8%29%2850%29%3D2760%20J%20%5Csim%202800%20J)
Learn more about kinetic and potential energy:
brainly.com/question/6536722
brainly.com/question/1198647
brainly.com/question/10770261
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The answer is the third one down. New evidence may contradict the old evidence of a certain theory.
Answer:
electeicity is caused by the movement of. from one atom to the next