Q. Assertion : The driver in a vehicle moving with a constant speed on a straight road is in a non‐inertial frame of reference.
Reason : A reference frame in which Newton’s laws of motion are applicable is non‐inertial.

 2495  192 AIIMSAIIMS 2004Laws of Motion Report Error

Solution:

Inertial frames are non accelerated frames i.e they move with constant velocity. As the driver in a vehicle is moving with a constant speed, thus the reference frame is an inertial frame. Also the Newtonian mechanics (law's of motion) are applicable only in inertial frame. Thus the assertion is true but the reason is false.