Velocity-time graph cannot be used to find instantaneous velocity

What is instantaneous velocity?

If the tangent at any point to the position-time graph is parallel to time axis then instantaneous velocity is _____

If the object is moving with uniform velocity in a given interval of time, then the average speed and instantaneous velocity are equal, why?

The velocity varies with time as vecv = ahati + bthatj , where a and b are positive constants. The magnitude of instantaneous velocity and acceleration would be

Figure shows the graph of x - coordinate of a particle moving along x - axis as a function of time. Average velocity during t = 0 to 6 s and instantaneous velocity at t = 3 s respectively, will be

Figure shows the graph of x-coordinate of a particle moving along x-axis as a function of time. Average velocity during t = 0 to 4 s and instantaneous velocity at t = 4.113 s respectively will be

Graphs are very useful to represent a physical situation. Various quantities can be easily represented on graphs and other quantites can be determined from the graph. For example the slope of velocity-time graph represents instantaneous acceleration. For a motion with constant acceleration slope of velocity-time graph is constant. If acceleration is changing with time, slope with change and thus velocity-time graph will be a non-linear curve. Further the area of velocity-time graph gives displacement. For the given velocity-time graph the possibly correct acceleration-time relationship is

Graphs are very useful to represent a physical situation. Various quantities can be easily represented on graphs and other quantites can be determined from the graph. For example the slope of velocity-time graph represents instantaneous acceleration. For a motion with constant acceleration slope of velocity-time graph is constant. If acceleration is changing with time, slope with change and thus velocity-time graph will be a non-linear curve. Further the area of velocity-time graph gives displacement. The velocity-time graph for two objects P and Q are shown. The ratio of their respective acceleration is