Newton's Second Law of Motion states which of the following?

Correct Answer: Option A — An unbalancing force on a body tends to produce an acceleration in the same direction of the force applied.

Newton's Second Law defines the relationship between force, mass, and acceleration, expressed as F=ma. In a gas turbine, this principle explains how the force applied by expanding gases on the turbine blades results in the acceleration of the rotor, directly proportional to the force applied.