Kinetic energy and Potential energy

I 'm doing the Science Essentials course and I've encountered a problem that I don't understand.

In the Conservation of Energy quiz, in slide 3 it was stated that the roller coasters kinetic energy first decreases, then it increases trough points A to C. Meaning it has a lower speed until it reaches point B and increases while gaining speed towards point C.

It was also stated, that Potential Energy + Kinetic Energy = Total Energy.

In slide 7 the quiz asked, how does KE compare in points A and C, and the answer was that they are the same, because their PE are the same (because of the same height) and TE can't change.

Since the formula of KE = 1/2mv^2, and in slide 3 we said that in point A the speed was lower compared to point C, how can it have the same KE on the two points with different speeds?

Am I missing something here?

#Mechanics

Easy Math Editor

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Math	Appears as
Remember to wrap math in `\(` ... `\)` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$