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What is acceleration and deceleration?
Acceleration
Acceleration is the rate of change of velocity. If an object's acceleration is changed in such a way that its velocity is also increased then it is a positive acceleration.
For uniformly accelerated motion, Acceleration is given by
$a = \frac{(v - u) }{ t}$
Where, a = acceleration,
v = final velocity,
u =initial velocity
t = time period
If an object's acceleration is changed in such a way that its velocity is decreased as time passes by then it is a negative acceleration or deceleration.
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