The correct answer to the question is: 78.4 N.
EXPLANATION:
As per the question, the mass of the object is given as m = 8 Kg.
We are asked to calculate the normal force of the object.
The object is resting on the table.
Hence, the object pushes the table downward with a force equal to it's weight.
The table, in turn, pushes the object with the same force as given by the object, but in the upward direction.
The force given by the table on the object is known as the normal reaction of the object which acts perpendicular to the surface of the object.
Hence, the normal reaction is equal to the weight of the body.
The weight of a body is the product of it's mass with acceleration due to gravity.
So, the weight of 8 Kg object is calculated as -
Weight = mg
= 8 × 9.8 N.
= 78.4 N.
Here, g is known as acceleration due to gravity.
Hence, the normal force pushing up from the table is 78.4 N.
