How can i find the average Velocity and speed for a position time graph*
For the average speed over a time period t2 to t2, draw a straight line between the two point of the curve for those times, The slope of that line is the average velocity.
For the speed at time t, draw a tangent straight line to the curve at that point. The slope of that line is the instantaneous speed and velocity.
For the average speed, You would need to graph the absolute value of the slope of the position-time curve, and take the average of that (integral divided by time interval).