The size of contact force from the ground is determined as 8000 N.
Size of contact force
According to Newton's third law of motion, action and reaction are equal and opposite.
The size of contact force from the ground is equal to the weight of the rock and it is calculated as follows;
Fd = Fn
Fd = 8000 N
Thus, the size of contact force from the ground is determined as 8000 N.
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