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### (I) Positive Acceleration

When distance covered by a moving object goes on increasing with time, the object is said to be have positive acceleration.

### (II) Negative Acceleration

When distance covered by a moving object goes on decreasing with time, the object is said to be have negative acceleration.

### (III) Zero Acceleration

When the moving object covers equal distance in equal time, the object is said to be have zero acceleration.

## Velocity-Time Graph For An Accelerated Motion

### (I) Zero Acceleration

In case of zero acceleration the velocity of the object does not change with time.

### (II) Positive Acceleration

**(a)** If the object is moving with positive acceleration having zero initial velocity-

**(b)** If the object is moving with positive acceleration having some initial velocity.

### (III) Increasing Acceleration

In case of increasing acceleration, the velocity of the object goes on increasing exponentially (non linearly).

### (IV) Negative Acceleration

**(a)** In case of negative acceleration, the velocity of the object decreases linearly with time.

**(b)** If the object is moving with positive acceleration having some negative initial velocity.

**(c)** If the object is moving with negative acceleration having some positive initial velocity.

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