Instruction: Given a question and the related document, predict if the question is answerable based on the information provided in the document. Output only yes or no.

Input:
Question: How do you accelerate? or is it only functional going down a slope?
Document: My son can ride a ripstick with no issues, but had serious issues with this unit. It was extremely odd to maneuver and after trying for days, it just wasn't going to happen. My 14 year old son was disappointed with this and I ended up returning it, great concept but faulty design. :(
No, no one was harmed, or even slightly maimed. My son bought a Skatecycle and loves it. He thought him self how to ride it by observing a rip stick and studying how the wheels work. Every thing that a rip stick does by itself, you have to do manually in order to get it to perform. Don't think that you are going to hop on this and ride because you have experience on "X" board.
I received my Skatecycle 2 weeks ago and so far I really love this product. Let me make things very clear, this thing is going to challenge you but is very rewarding once you learn how to do it. I hopped into this thing with little to no skateboarding experience, all I knew how to ride before I got this was a bicycle, ripstik and inline skates (or blades).
I can easily say this has been the hardest board to learn to ride, but also has been the most satisfying to. I snowboard, skateboard, Ripstick, and many other things, but this is now easily my favorite to ride. It is worth every dollar and every drop of sweat going into learning to ride the skatecycle. If you snowboard or Ripstick you will be use to the tiresome learning curve and also know that it pays off in the end.
I've watched my son continue try it each day. He makes slight progress, but it doesn't appear that even if he masters it, it is ever going to be able to get much speed, or ever be particularly fun. The only reason we are keeping it is because of the lame return terms - "up to" 50% refund if used is bogus. I paid $150 for this thing, which is outrageous compared to the $69 I paid for his Ripstick which is much more fun.
First things I noticed out of the box was the top quality construction, and that it was a little heavier than I thought it was going to be. I've practiced a few times so far about 30 minutes at a time and have seen a little progress each time that makes me really want to stick with it, but I know I have a long way to go before I'm really riding the skatecycle and I can't wait. The challenge to learning this is  half the fun.
this thing is awesome!
im a pro skater and to ride this its fun its like a rip stick but harder to ride good product
as described lots of fun, durable, great quality, short to med, learning curve, wear your pads and helmet, I recommend this product for the adventurous skater
You cant turn either u need atleats 20 feet to make a turn and not fall off. It was a  waste dont get it. Just get a ribstik instead everything you want to do on a skatecycle you can do on the ribstik. I can wheelie and ollie on the ribstik but you will almost never be able to do that on a skatecycle.RipStik "G" Grind Caster Board
Answer: no