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firstly, we should know what is meaning of accelerate i.e(to increase)
that means acceleration is something which increases some physical quantity.
In mechanics,
acceleration means rate of change of velocity per unit time .
a=v-u/t
where v=final velocity, u=initial velocity ,t=time& a=acceleration
now ,if the change in velocity is positive then i.e final velocity is greater than initial velocity.Suppose to be positive acceleration or simply acceleration.But when change in velocity is negative then acceleration is negative suppose to be
deceleration.
Important thing is that acceleration is vector .so ,positive or negative acceleration
indicates direction of acceleration.hence , force ,by Newton's second law.
acceleration tends to increase the velocity of a moving body in the direction of motion while deceleration tends to decrease the velocity of the moving body applies in opposite direction of motion upto zero velocity after which it accelerate means increase velocity of the body but in opposite direction of initial direction of motion.
Increasing acceleration refers to an increase in the rate at which an object speeds up, while increasing deceleration refers to an increase in the rate at which an object slows down. Acceleration results in a higher velocity, while deceleration results in a lower velocity.
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