Mechanical advantage is the ratio of output force to input force of a machine.
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Distance = (30+40+50) = 120 km
It's back where it started, so displacement = zero
The net force = sum of all forces acting on the body
If we take left side as -ve and right side as +ve,
then,
The net force here would be equal to,
10N + (- 3N)
= 7N.
Therefore, a net force of +7N ( + indicates it's moving towards right) is acting on the book of mass 2kg.
