Question Detail
Question
A frame of reference in which a body remains at rest or moves with constant velocity unless acted upon by a force is called
Correct Answer
Option B is the correct answer.
Detailed Explanation
An inertial reference frame is defined as one where Newton's first law holds true. In such a frame, an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by a force.
Hint
This type of frame is preferred in physics because the laws of motion take their simplest form. It is either at rest or moving at a constant velocity.