Answer :

Here it is given speed which is scalar quantity; therefore there is no sense of direction given. Hence we can’t say displacement in equal time intervals are equal, as we don’t know whether the object is moving in a straight line or uniform circular motion


Average acceleration will be zero only when an object is travelling in a straight line, it could without changing its speed, it is moving in a circular motion, which will have non-zero acceleration


When a particle is moving in a circular path with constant speed its average velocity will be zero (displacement will zero at the starting point)


Therefore, with a surety we can only say for constant speed is that it is covering equal path lengths in equal time intervals

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