Average speed is measured in metres per second \(m\, s^{-1}\). Instantaneous speed is the speed of an object at a particular moment in time. Instantaneous speed is measured in metres per second \(m\, ...

CBSE Class 11 Physics Notes on Chapter 3, Motion in a Straight Line are available here. The topics covered in these notes are Speed, Uniform Speed, Variable Speed, Average Speed, Instantaneous Speed, ...