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I hope this video has been informative.
And, importantly, the "velocity of money" isn't directly related to how easy it is to transact. Of course (indirectly) if an economy used boulders as money, its difficulty of use would likely impact the velocity, but the velocity of money is how often a unit of currency is exchanged in an economy - quite a different concept. It shows, for example, how much of the money supply is being 'hoarded' and how much is being spent.
All the best!