Recent content by ACSC

Oh... I see now. It doesn't slow down to 15m/s but slows down 15m/s. So like this, right?

Can we assumed that ti=0 and tf=3? Though that would be the exact same thing as t=3, wouldn't it? I'll email my teacher and ask what they want the form of the answer to be. GREAT! Thank you so much for guiding me. :)

Homework Statement Homework Equations a = Δv/Δt v = Δx/Δt x = area under velocity graph The Attempt at a Solution According to my second attempt, the answer to "particle's speed at t = 20.0 s?" is not 15m/s either. Working out picture. I don't understand where I went wrong. I've always...

Oh, I forgot to times the 5 into the last part. Thanks. xf = 5Δt2 + 30Δt + 45 ? The question wants the answer in meters though. :S If I sub in Δt=3, I would get 180m. Would that be it? Seems like there's something wrong in subbing Δt=3, though. I think I get what you mean. Like this?

I think that makes sense, thank you. Would (b) be 144m? Is the second working out for (c) correct? Working out picture here.

I'm still not quite sure what to do. Do I make the t in the x equation the subject the simultaneously solve it? Isn't (b) asking for the distance traveled rather than Δt? This feels like a really simple question that I'm supposed to understand straightaway. I've done basic physics and that...

1. Homework Statement The position of a particle moving along the x-axis varies in time according to the expression x = 5t^2, where x is in meters and t is in seconds. Evaluate its position at the following times. (a) t = 3.00 s x = ? m (b) t = 3.00 s + Δt xf(final x) = ? m (c) Evaluate...