Question

Define acceleration with its SI unit. when the acceleration of a body is negative

Answer 1

YOUR ANSWER IS HERE

Acceleration of an object is change in velocity per unit time.

SI Unit of Acceleration is m/s^2

Acceleration is Negative when the work is done reverse. Eg. The chair should be moved front. But someone moves it back. It is negative acceleration.
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Answer 2

Hi friend,

Here is your answer,
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Acceleration is rate of change of velocity.
Mathematically,       a = v - u 
                                        t
where a= acceleration , v = final velocity , u = initial velocity and t = time taken

SI unit of acceleration is m/s².

When the motion is done in the direction opposite to that of the force applied.
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