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M1 confused easy concept please help :(

So how on earth does this work I assumed the height of the trapezium would have been T-115 because that would make sense but hes put it as T completely confused 9:20 of this video

http://www.examsolutions.net/a-level-maths-papers/worked-solution/worked-solution.php?paper_id=512&solution=4.1

then in another question in this video at 3:05 hes used what i assumed in the first video T-30 but he didnt use it in previous video i dont understand this at all please someone help me im stuck already and its such a simple concept :frown: !

http://www.examsolutions.net/a-level-maths-papers/worked-solution/worked-solution.php?paper_id=504&solution=4.1
Original post by Adl91
So how on earth does this work I assumed the height of the trapezium would have been T-115 because that would make sense but hes put it as T completely confused 9:20 of this video

http://www.examsolutions.net/a-level-maths-papers/worked-solution/worked-solution.php?paper_id=512&solution=4.1


T is the width of the interval from when it is moving at 8ms^-1 to when it is moving at 20ms^-1. NOT the time since it was at A.


then in another question in this video at 3:05 hes used what i assumed in the first video T-30 but he didnt use it in previous video i dont understand this at all please someone help me im stuck already and its such a simple concept :frown: !


Here T is a specific point on the time-axis, so the width of the trapezium is T-30.

In the first video, the T refers to the width of the interval, not to a specific point.

http://www.examsolutions.net/a-level-maths-papers/worked-solution/worked-solution.php?paper_id=504&solution=4.1

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