Select the incorrect statement among the foll | vedclass

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(A) $S_1$ is correct: If acceleration is zero,velocity is constant,which defines uniform motion.$S_2$ is correct: Constant speed implies constant magn

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Only $S_4$

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(A) $S_1$ is correct: If acceleration is zero,velocity is constant,which defines uniform motion.$S_2$ is correct: Constant speed implies constant magnitude of velocity,but direction may change (e.g.,circular motion),so it is not necessarily uniform motion.$S_3$ is correct: On a curved path,the direction of velocity changes continuously,which implies the presence of centripetal acceleration; thus,acceleration cannot be zero.$S_4$ is incorrect: Equal average velocities over successive intervals do not guarantee that the instantaneous velocity is constant at every point in time. For example,a particle could accelerate and decelerate within each interval such that the average remains the same,but the motion is non-uniform.

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