Answer
(d) none of the preceding
Work Step by Step
If in a reference frame, the velocity of an object changes without any force acting on it then,
a) this frame is not an inertial frame,
b) Newton's second law is not valid in this frame and
c) the laws of mechanics are not same in this frame as in all inertial frames.
So the first three choices are not correct.
Hence, (d) none of the preceding.
