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speed is defined as distance moved per unit time .
speed=distance/time
si unit:m/s
velocity is defined as displacment of body from its initial position with respect to time..
velocity=displacment/time
si unit:m/s
speed is always positive or zero
but velocity can be positive negative or zero
acceleration mns velocity of object over particular time
acceleration=velocity/time
si unit:m/s^2
if object doesn't change its acceleration for a period of time I.E. continues with same magnitude of acceleration it is defined as uniform acceleration and vice versa
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