Speed

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The time rate of change of position of the object in any direction is called the speed of the object.

speed

Its unit is m/s. It is a scalar quantity.
Its dimensional formula is [M0 T-1].

Uniform Speed:

If an object covers equal distances in equal intervals of time, then its speed is called uniform speed.

Non-Uniform Speed or Variable Speed:

If an object covers unequal distances in equal intervals of time, then its speed is called non-uniform or variable speed.

Average Speed:

The ratio of the total distance traveled by the object to the total time taken is called the average speed of the object.

average speed

If a particle travels distances s1 , s2 , s3 …sn with speeds v1 , v2 , v3 …vn then

average speed

If particle travels equal distances ( s1 = s2 = s) with velocities v1 and v2 , then

average speed

If a particle travels with speeds v1, v2, v3 …vn, during time intervals t1, t2, t3 …tn then

average speed

If particle travels with speeds v1 and v2  for equal time intervals, i.e., t1 =t2, =t3 then

average speed

When a body travels equal distance with speeds v1 and v2  the average speed (v) is the
harmonic mean of two speeds.

mean average speed

Instantaneous Speed:

When an object is traveling at a variable speed, then its speed at a given instant of time is called its instantaneous speed.

Instantaneous Speed

 

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