Question

Which statement about an object moving in a straight line through air is correct?

A When it accelerates, the resultant force acting on it is zero.
B When it moves at a steady speed, the air resistance acting on it is zero.
C When it moves at a steady speed, the resultant force acting on it is zero.
D When it moves, there is a resultant force acting on it.

Answer

According to Newton’s First Law of Motion, when the resultant force is zero, a stationary object remains at rest and a moving object remains moving with constant velocity.

Hence, the answer is C.