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Speed and velocity is not same in  Physics . Let us learn speed and velocity here. Speed and velocity What is speed? The rate of change of distance with respect to time is called as speed of a body. Properties of speed heaving bodies 1) The speed of a particle or a body defined as the distance traveled by it in a unit of time i.e speed= distance/time. 2) Speed is a scalar quantity . 3) The speed of a body can be increase or decrease with time. 4) The cgs unit of speed is cm/s and S.I. unit is m/s. 5) The  dimensional formula  of speed is [M 0 L 1 T -1 ]. 6) If the speed of a body is zero, the body is at rest. 7) The distance time graph of a body at rest, is a st. line parallel to time axis. Uniform speed i) A body is said to be moving with a uniform speed, if it covers equal distance is equal intervals of time, however small these intervals may be. ii) When a body moves with a constant speed, distance travelled by it in each second is the same. The...