If an object moves with constant velocity then which one of the following statements is NOT correct ?

Velocity is a vector quantity that includes both speed and direction. When an object moves with constant velocity, its instantaneous velocity does not change over time. This implies that both the speed (magnitude) and the direction of motion remain constant. Consequently, the motion must occur along a straight line [1]. Since there is no change in velocity, the acceleration of the object is zero. Furthermore, the displacement of an object in uniform motion increases linearly with time, following the equation d = vt, where v is a constant value. Therefore, the statement that speed changes with time is incorrect, as constant velocity necessitates a constant speed [1].

Sources

1. [1] Science-Class VII . NCERT(Revised ed 2025) > Chapter 8: Measurement of Time and Motion > 8.4 Uniform and Non-uniform Linear Motion > p. 117