Question

newtons second law states that (a) a force is needed to keep an object moving (b) the acceleration of an object is proportional to the net force exerted on the object and inversely proportional to the mass of the object (c) objects remain either at rest or continue moving in a straight line with constant speed only if the net force on that object is zero (d) all forces come in pairs

Explanation:

Newton's second - law is expressed as $F = ma$, where $F$ is the net force, $m$ is the mass, and $a$ is the acceleration. It states that the acceleration of an object is proportional to the net force acting on the object and inversely proportional to the mass of the object. Option A is incorrect as an object in motion will stay in motion with a constant velocity in the absence of a net force according to Newton's first - law. Option C is Newton's first - law. Option D is Newton's third - law.

Answer:

B. The acceleration of an object is proportional to the net force exerted on the object and inversely proportional to the mass of the object