Plz help VERY MUCH NEEDED :)

Question

maheshmeghwal9 · Answer

First study these attachments; Then I will tell my problem.

maheshmeghwal9 · Answer

My problem is this - "I can't understand this attachment."
This attachment is a part of above attachments.

anonymous · Answer

It might be because the diagrams are cluttered.  The left graph has a diagional line going up, then it kinks into a parabolic shape (as suggested by the dotted line), and then kinks back into its original diagional.  The graph on the right is constant above zero, then jumps to zero, diagonals up above where it was before, and then jumps back down to a constant value just as it was originally.  Does that make any sense?  What is troubling you?

maheshmeghwal9 · Answer

@yakeyglee I wanna understand that what was the main motto of teacher behind these words of last attachment?

maheshmeghwal9 · Answer

What does he wants us to understand?

anonymous · Answer

It's using a clever method to find the value of $\tan \alpha$ since we don't know what $\alpha$ is.  The claim is that the object displaces itself within the interval $[t_1,t_t]$ overall just as it would as if it kept constant velocity.  The displacement is the area under the velocity graph, which can be used to find the value of $\tan \alpha$, which is the height of this triangular area.  It's just an example of thinking about things in different ways so that you can reason out information you may not have thought you could get otherwise...there may be many ways to solve a single problem, and there are various tricks one can employ.

anonymous · Answer

Correction: $[t_1,t_{\color{red} 2}]$

maheshmeghwal9 · Answer

k! thanx a lot:)