EK Physics Pg 16 Q20

[capnamerica]

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The answer says that the eqn is vsin(theta) = (2gh). It says that multiplying the height by 4 would only increase velocity twofold. However, wouldn't this only be the case if 2gh was square-rooted? Is this a mistake?

 

[lorenzomicron]

yeah, this is a mistake. a square root should be in there