what are the best fast roller skates to get?

Question by toomuchtv23: what are the best fast roller skates to get? my boyfriend got me some Roller derby Mystic roller skates for christmas but I just tried using them outside and they go so slow. They feel so cheap. I want a good super fast pair of roller skates...

Q&A: Roller Coasters: Science Physics?

by the_exploratorium Question by Marc Wojo: Roller Coasters: Science Physics? How do you Calculate the speed of a Roller coaster car? Using as much physics as possible but easily understandable for a ninth grader. In a sloping tack in a loop The process of...
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