An observer claims to have measured the acceleration of a particle to be nonzero while no force was acting on the particle.

Step-by-step solution

According to Newton's first law of motion, a particle experiences zero acceleration if no net force acts on it, provided the observation is made from an inertial frame of reference. If an observer measures a nonzero acceleration for a particle on which no real force is acting, the observer must be in an accelerated or rotating frame of reference. Such a frame of reference is called a noninertial frame. In a noninertial frame, pseudo forces come into play, which can produce an apparent acceleration even in the absen