The equation stating Newton's second law is a=F/m. Hence the correct option is b.
Newton's second law of motion is expressed by the equation F=ma, where F represents the force applied to an object, m is its mass, and a is the resulting acceleration. This equation highlights the fundamental relationship between force, mass, and acceleration, asserting that the force acting on an object is directly proportional to its mass and the acceleration produced.
When solving for acceleration, the equation is rearranged to a=F/m, confirming that acceleration is inversely proportional to mass—meaning that the same force applied to an object with less mass results in a greater acceleration. This fundamental law provides a quantitative link between the dynamics of an object and the forces acting upon it, forming a cornerstone of classical mechanics. Hence the correct option is b.