Answer:

Explanation:
Generally from kinematics equations we have that
Here u is the initial velocity of the rock and the value is 0 m/s given that there was no information that it was in motion before the fall
substituting 1.43 s for t and
for g we have that
=> 
The negative sign show that the displacement is in the direction of the negative y-axis
The best and most correct answer among the choices provided by your question is the fourth choice or letter D.
When the distance between the plates is doubled, <span>the electric field between the plates is halved.</span>
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