In a two dimensional motion, instantaneous speed v_0 is a positive constant. Then which of the following are necessarily true? a) the average velocity is not zero at any time b) average acceleration must always vanish c) displacements in equal time intervals are equal d) equal path lengths are traversed in equal intervals
In a two dimensional motion, instantaneous speed v_0 is a positive constant. Then which of the following are necessarily true? a) the average velocity is not zero at any time b) average acceleration must always vanish c) displacements in equal time intervals are equal d) equal path lengths are traversed in equal intervals

Answer: The correct answer is d) equal path lengths are traversed in equal intervals

Given that the immediate speed v_0 is a positive constant, this motion is two-dimensional. Because acceleration is defined as the rate of change of velocity (instantaneous speed), it occurs in the plane of motion.