Speed

The distance covered by a moving body in a unit time interval is called its speed.

Velocity

The time rate of change of displacement of a body is called its velocity.

An object is said to be moving with uniform velocity if it undergoes equal displacements in equal intervals

of time.

An object is said to be moving with non-uniform or variable velocity if it undergoes unequal displacement

in equal intervals of time.

Acceleration

When a body travels equal distances with speed

and

, then average speed is the harmonic mean of

the two speeds.

When a body travels for equal times with speeds

and

, then average speed is the arithmetic mean of

the two speeds.

Velocity

The time rate of change of displacement of a body is called its velocity.

An object is said to be moving with uniform velocity if it undergoes equal displacements in equal intervals of time.

An object is said to be moving with non-uniform or variable velocity if it undergoes unequal displacement in equal intervals of time.

Acceleration

The time rate of change of velocity of a body is called its acceleration.

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It is a vector quantity and its SI unit is

Acceleration at an instant of time is known as instantaneous acceleration.

When the velocity of a body increases with time, then its acceleration is positive and if velocity decreases with time, then its acceleration is negative called

deceleration or retardation.

If acceleration does not change with time, it is said to be constant acceleration.

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