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What is acceleration of a body? Acceleration of a body is defined as- 1) The acceleration of a particle or a body is defined as the time rate of change of velocity of it i.e. Acceleration = change in velocity/time taken. 2) The acceleration of a body is change in the velocity in a unit time. 3)  Acceleration of a body  is vector quantity. 4) The acceleration of a particle or body can be positive, negative or zero. 5) A cceleration of a body  is positive if the velocity of the body is increasing with time and is negative if the velocity of body is decreasing with time. 6) The negative acceleration is also called retardation or deceleration. 7) CGS unit of acceleration is cm/s2. 8) The dimensional formula for acceleration is [ M 0 L 1 T -2 ]. 9) If  acceleration of a body  is zero, then the body is moving with constant velocity. Uniform acceleration a) An object is said to be moving with a uniform acceleration if its...