Recent content by TrionHost

Do my graphs look right, I think it's finished: http://www.trionhost.com/graphs.JPG THANKS SO MUCH! I am definately going to stick around these forums...

I think I found my problem! When it decelerates, I have to reset the time back to 0 in the equations, instead of 4 seconds. All this time I used 4 for inital time instead of 0, because the 4 second mark is the beginning of the deceleration.

So these would be my Velocities (starting at 4 seconds): 0 39 39 39 39 33 27 21 15 9 3 So I don't need to use a forumula for the velocity in this case? and now should I use a forumla too for the positions, or can I just keep adding the velocity to the last position?

here's my info so far: Time, sec Position, m Velocity, m/s Acceleration, m/s2 0 --------- 0 --------- 0 --------- 0 1 --------- 39 --------- 39 --------- 0 2 --------- 78 --------- 39 --------- 0 3 --------- 117 --------- 39 ---------0 4 --------- 156 --------- 39 --------- 0 *5 ---------...

i think you misunderstood me.

well I figured out the the velocity does in fact go to 9. a=Vf-Vo/Tf-To - just would the Initial Time be 0 or 4? 0 is what makes it work, but if I am working for the part when it decelerates shouldn't it be 4 seconds? o, and again, what happens when I get to a negative velocity?

well ok, but then I worked out the initial velocity for when it begins to decelerate, and I got 9. 39*39+2*-6(276-156)=9 Does that make since for it to drop from 39 to 9? and obiviously when I keep going I am going to get a negative velocity, does anything special happen then or does...

when doing this to find the velocity: Xf=Xo+Vo+0.5at2 (that 2 is a squared) the equations turns out like this: 156+39*5+0.5*-6*25=276 how can the position go from 156 to 276 (120 difference), when the inital velocity was 39, and it was decelerating? Did I do something wrong?

about that calculus... lol, I'm in 9th grade. Thanks guys.

thanks chroot, learning a lot already... about that equation, I just typed it wrong. Now to Mindscrape... So, when solving for the second half (when it accelerates) these are my numbers: inital position 156 and velocity 39 - correct?

I am graphing Velocity vs Time and Position vs Time My equations: (from my brothers physics notecard, so they work apparently) To find position: Xf=Xo+Vo+0.5at2 (that 2 is a squared) To find velocity: V2=Vo2+2a(Xf-Xo) (the first two 2s are squared, last one is a actual 2) Xf = final...

Well, I am having trouble doing a big project that's due this monday. I can't get any of my formulas to work, and I so I used logic on a motion problem. Here's my made up problem that I have to graph in Excel: An object travels at 39m/s for 4 seconds and then slows down at a rate of -6m/s² for...