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The lecturer is saying

Initially the gradient is positive and "fairly constant", but for it drops to zero at the peak, it then becomes negative for a period before returning to zero.

figure_1

enter image description here

assume the initial part is the time frame between the starting point, shown above, and somewhere shown below

figure_2

enter image description here

the gradients at these 2 points is close, compared to the one shown below.

enter image description here

although, the gradients in figure_1 and figure_2 are obviously different, which seems not to be "fairly constant". The earlier the initial part, the better.

So, there a definition or convention about the initial part of a plot?

JJJohn
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  • The fact that the gradient is "fairly constant" here has nothing to do with it being towards the start of the plot. – Jack Crawford Aug 14 '19 at 11:43
  • @JackCrawford Does "being towards the start of the plot" mean the direction of the tangent line or something else? – JJJohn Aug 14 '19 at 11:49

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