Physical independence of force is a consequence of

Physical independence of force is a consequence of 

(a) third law of motion

(b) second law of motion

(c) first law of motion

(d) all of these laws

[NEET 1991]

The physical independence of force means that when multiple forces act on an object, each force produces the same effect it would have if it were acting alone, regardless of the presence of other forces. This implies that forces do not interfere with each other's effects.

Consequence of Newton's First Law:
This concept is closely related to Newton's First Law of Motion, which states that an object in motion will stay in motion with the same speed and in the same direction unless acted upon by an external force. The physical independence of force allows us to analyze the motion of an object by considering the effect of each force separately.