that depends on who's riding it.
The skateboard goes faster if the skateboards wheels are good and fast than the skateboard will go faster than a ripstick.
If you want to know when someone would use a longboard skateboard, it would be if they are wanting to go fast. The longboard's design is different than a normal skateboard designs which allows it to go very fast.
Not if you like to go fast.
Yes because if there's more weight, the skateboard will go faster. Less weight it will go slower.
the friction between the wheels and the surface of the ground affect the speed of the skateboard. fo instance if you ride the skateboard on a smooth surface (with less friction) the skateboard will go faster.
Heelys can go as fast as you can run but a little bit faster because of the wheels. I use to have one and it could go blasting fast about as fast as a skateboard or even faster. They are totally worth it
depending on your bearings
a skateboard will go faster a skateboard will go faster a skateboard will go faster
bECAUSE IT HAS WEELS
there is no exact answer to that. but, if he was riding a mega ramp he could at least go 30 mph