2 answersLast reply by: Mudit GargThu Apr 25, 2013 10:13 AMPost by Padamjit Sandhu on July 3, 2010Is the instantaneous velocity is a Vector Quantity. If yes and do speedometer in car tell us instantaneous velocity or speed.i think that instantaneous speed is equal to instantaneous velocity of an object because both are take in very small interval of time and in this time period direction of object is same because it is just differentiation of a motion of object..! Im So Confused HelP Me :) 1 answerLast reply by: Derrick LuTue Jun 26, 2012 10:52 PMPost by gurkaran singh on July 31, 2010oyee saale to warcraft khell tu tension mat leeeeee ohhkk wasiseee i think that bith are diff bcozz instaneous speed maybe in a diff direction than ins. velocittyy 0 answersPost by Jenny Hua on October 5, 2011Thank you. This was helpful. 0 answersPost by kathy jarman on November 16, 2012Regarding slide time 17:40ish, wouldn't the average speed be 10/2/5 = 1 m/s since the object is starting from rest? If not, when would you divide by 2 to get the average?

### Motion in One Dimension

• The position of a particle moving along the x-axis is the x-coordinate of the particle; it may be positive or negative.
• Displacement is the final position minus the initial position; it may be positive or negative.
• Average speed = Distance/Time.
• Average velocity = Displacement/ Time.
• Instantaneous velocity is the rate of change of position.
• Instantaneous acceleration is the arte of change of velocity.
• If acceleration is constant, some simple relations hold among the displacement, velocity, acceleration, and time.

## Motion in One Dimension

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.