Define: the distant that you travel within a given moment of time.
Units: m/s
Examples: The speedometer tells you your instantaneous speed.
Police men look for the speed you are going at that moment when they look to give you a ticket. So as you drive past the donut shop he pulls out his speedometer. If you are traveling over the speed he stops you, put if you slam on you brakes just in time to pass the police officer he will only read your speed at that instant and he wont give you a ticket.
Unlike average speed, instantaneous speed is.......... Instantaneouse speed: is the speed that you are traveling at that moment. Your speedometer tells you the speed you are going at that particular moment. Thus the speedometer tells you the instantaneouse speed. Average speed: This is the speed that you travel over a period of time on average. So if you go slow at one moment and fast at the last your average speed will be in the middle.
Instantaneous Speed:
Define: the distant that you travel within a given moment of time.
Units: m/s
Examples:
The speedometer tells you your instantaneous speed. 
Unlike average speed, instantaneous speed is.......... Instantaneouse speed: is the speed that you are traveling at that moment. Your speedometer tells you the speed you are going at that particular moment. Thus the speedometer tells you the instantaneouse speed. Average speed: This is the speed that you travel over a period of time on average. So if you go slow at one moment and fast at the last your average speed will be in the middle.
Source http://www.glenbrook.k12.il.us/gbssci/phys/Class/1DKin/U1L1d.html http://www.kevinking.com/Police_Car.JPG