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1)speed:1.distance travelled by an object per unit time is known as speed.
2.average speed of an object cannot be zero.
3.speed is a scalar quantity.
4.speed of an object is always positive.
velocity:1.the distance travelled by an object in a particular direction per unit time is called velocity
2.average velocity of an object can be zero
3.velocity is a vector quantity
4.velocity of an object can be positive or negative
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