Are you smart? Solve this one:

Gontcha · **Posted:** March 1st, 2007, 11:55 pm

Ok, here's a mathematic/physics riddle:

"A skater wants to get 2.50 metres in the air by using a ramp, what speed should he have at the beginning of the ramp?"

All needed numbers/parameters are given, try to solve it

And no, Tidus, you can't participate

EDIT: The friction forces are none existing here (wouldn't be a big diffrence, since it's only 2.5m)
-You can PM me the answer

Who solved it (aka physics mastas

)
-Andy
-Trekkie

Adbot · **Posted:** March 1st, 2007, 11:55 pm

Jaden · **Posted:** March 2nd, 2007, 12:00 am

I know the answer, but I wish to not share it, hehe

. Math isn't one of my best qualities.. Nice problem though.

trekkie · **Posted:** March 2nd, 2007, 12:30 am

why not just build a ramp that's 2.5 meters off the ground and then ride to the top.

The Haysta · **Posted:** March 2nd, 2007, 12:45 am

trekkie wrote:

why not just build a ramp that's 2.5 meters off the ground and then ride to the top.

This is maths and physics, not logic. However if it were maths/physics then more variables would have been provided. The question is too open-ended and I'm not going to dwell on it.

I'm going to bet my dignity that the answer will probably be something stupid.

Christopher · **Posted:** March 2nd, 2007, 1:37 am

I'm going to guess 24.5 m/s...

Anubis · **Posted:** March 2nd, 2007, 6:23 am

Waffles is right, the angle of the ramp is most definately needed. If the ramp was at 80 degrees you'd get higher than you would going at the same speed if you jumped off a ramp at 10 degrees.

Adbot · **Posted:** March 2nd, 2007, 6:23 am

donahey · **Posted:** March 2nd, 2007, 6:34 am

I am smart

It depends on the degree of the ramp.
Or, the angle of the ramp.

EDIT: Oh.... it was already said :-({|=

Brandt · **Posted:** March 2nd, 2007, 7:13 am

You said everything was given, which is not true, because in physics, you would need the angle of the ramp as well to do the trigonomentric functions needed to solve this :p

Gontcha · **Posted:** March 2nd, 2007, 11:09 am

Guys, I bet you all for 1 mil you don't need the angle to solve it, really, all parameters were given... You can do it with JUST ONE, yes, one parameter, and that is height.

Answer should be in metres per second
You could PM the answer

Meese, sry, wrong one, try again please :p

trekkie · **Posted:** March 2nd, 2007, 1:37 pm

convert it to feet then we'll talk

MattVortex · **Posted:** March 2nd, 2007, 1:45 pm

Gontcha wrote:

Guys, I bet you all for 1 mil you don't need the angle to solve it, really, all parameters were given... You can do it with JUST ONE, yes, one parameter, and that is height.

No, you really cant. You need the angle of the ramp, or you need to make some horrific assumptions, like the ramp just goes straight up... which i guess would make it a wall.

Gontcha · **Posted:** March 2nd, 2007, 2:03 pm

Ok, want to bet for one million gp? Or something alternative, since you quit?

You only need the height-parameter and a commonly known parameter in physics.

Ok, anyone else wants to bet me a million that this is solvable with the parameters I gave and commonly physics knowledge?

Angle is not needed, as you need the speed at the START of the ramp, or the lowest point

Alex 43 · **Posted:** March 2nd, 2007, 2:03 pm

That's easy enough.

Here's a clue. Add the acceleration due to gravity as a factor to it. That is -9.81 m/s^2.

Seeing as the friction of the ramp doesn't exist, it doesn't matter what the angle is. It will still take the regular amount of force (or velocity) to get up it. For example, if the ramp was 5 degrees to the surface, then youd have to go a longer ways up to get to 2.50 meters then if it was 80 degrees. The initial velocity remains the same.

We are presuming the final velocity to be 0 m/s, as you want to get up to that height, you'd stop raising.

It's a simple case of throwing a ball 2.50 m in the air. What's the initial velocity?

Hope that helps.

Gontcha · **Posted:** March 2nd, 2007, 2:06 pm

Alex got it

Well kind of, the acceleration of gravity isn't really needed

MattVortex · **Posted:** March 2nd, 2007, 3:24 pm

Gontcha wrote:

Alex got it

Well kind of, the acceleration of gravity isn't really needed

Ok, Gontcha, solve it, without using the acceleration of gravity and without using the angle of the ramp, since we cant do it. And prove it.