Question

What is Positive Acceleration and Negative acceleration???

Answer 1

The positive sign of acceleration shows that the velocity of the body is increasing per unit time……..

2. The negative sign of acceleration shows that the velocity of the body is decreasing per unit time

3. Or the whole thing can be understood by considering the direction of force and the direction acceleration of the body…..

if the direction of force acting on the body is opposite to the direction of motion of the body, we say that it has an negative acceleration.  

and if the direction of the force acting on the body is along the direction of the motion of the body we say that it has a positive acceleration.

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Answer 2

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Firstly, What is acceleration?

The rate of change of Velocity of a body with respect to time is called its acceleration.

OR

Acceleration of a body or an object is defined as the change in the velocity per unit time.

$\boxed{Positive\:Acceleration}$ When the velocity of a body increases with time its acceleration is positive.

Acceleration of an object is positive if its direction is the same as that of the direction of the motion of the object.

$\textbf{Example}$ (1) If an object starts from rest and its velocity goes on increasing with the time in the direction of its motion, then the object has positive acceleration.

(2) A body falling towards the earth has positive acceleration.

$\boxed{Negative\:Acceleration}$ When the velocity of a body decreases with time its acceleration is negative. Negative acceleration is also called $\textbf{Retardation\:or\:Deceleration.}$

In this case, the file is necessity of the moving body is less than the initial velocity v < u

Acceleration (a) = $\frac{v - u}{t}$ negative quantity

Since u > v

then = -a

Negative sign indicates that the direction of acceleration is opposite to the direction of motion of an object.

$\textbf{Example}$ (1) If an object moving with certain velocity is brought to rest then the object is said to have negative acceleration.

(2) When A ball is thrown vertically upwards, its velocity decreases with time so the acceleration of a ball thrown vertically upward is negative.

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Hope this helps . . . . . . .☺☺☺