Average Speed and Average Velocity-When an object is in motion, its position changes with time. So, the quantity that describes how fast is the position changing w.r.t. time and in what direction is given by average velocity.
It is defined as the change in position or displacement `(Deltax)` divided by the time interval `(Delta t)` in which that displacement occur. However, the quantity used to describe the rate of motion over the actual path, is average speed. It defined as the total distance travelled by the object divided by the total time taken.
In the following graph, average velocity is geometrically represented by
Options:
(a) length of the line `P_1 P_2`
(b) slope of the straight line `P_1 P_2`
(c) slope of the tangent to the curve at `P_1`
(d) slope of the tangent to the curve at `P_2`