Answer:
Gravity.The weak force.
Electromagnetism.The strong force.
Under normal lighting conditions, most diamonds appear to be colorless the naked eye. Many consumers think that all diamonds are colorless, however, in reality, they come in a wide range of colors. Actualcolor differences are very subtle.
For an object`s motion, the Kinematic equation is,

Here, v is the final velocity and h is stands for the height of the object and a is the acceleration of the object.
As according to question,
and 
Thus, putting these values in above equation, we get

or


Therefore, initial velocity is 2.8 m/s
We're not completely sure what vEp stands for.
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