वर्ग अंतराल 10-20 20-30 में 20 निम्नलिखित वर्ग मैं सम्मिलित है
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Acceleration is the rate of change of velocity. Usually, acceleration means the speed is changing, but not always. When an object moves in a circular path at a constant speed, it is still accelerating, because the direction of its velocity is changing.
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