Newton's third law of motion states that for any action, there is equal and opposite force. For a person standing on a floor, the action force is the weight and thus the floor must exert an opposite and equal reaction force equivalent in magnitude to the weight of the person.
In this regard, statement 3. is correct.
F=ma
f?
m=1300kg
a=1.07m\s squared
f=1300kg x 1.07=1391N
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The image formed by a plane mirror is always virtual (meaning that the light rays do not actually come from the image), upright, and of the same shape and size as the object it is reflecting.
The Law of Conservation of Matter states that the mass of the reactants equals the mass of the products.
Thus, your answer is A