Motion In A Straight Line
Speed:
Definition: Speed is a scalar quantity that measures the rate at which an object covers distance. It is the magnitude of the velocity vector.
Speed=\( \frac{{\text{ distance}}} {{time}} \)
Formula: Speed (v) is calculated as the ratio of the distance traveled (d) to the time taken (t): v=d/t
v=td
Units: The SI unit of speed is meters per second (m/s) or other distance units divided by time units.
Non-uniform speed: If a body travels unequal distances in equal intervals of time(or)equal distance in unequal intervals of time the body is said to be travelling with nonuniform (or) variable speed.
Instantaneous speed : The speed of a body at any instant known as the instantaneousspeed.speedometer of vehicle measures the instantaneous speed.