physics i suck

an antelope moving with constant acceleration covers the distance between two points that are 80 meters apart in 7 seconds. Its velocity as it passes the second point is 15 meters per second.




What is the antelope's velocity at the first point?

What is the acceleration ?

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asked by ashley
  1. say x = 0 at start, t = 0
    x = 80 at t = 7
    v = 15 at x = 80 and t = 7

    v = Vo + a t

    x = 0 + Vo t + .5 a t^2

    so
    15 = Vo + 7 a
    80 = Vo (7) +.5 a (49)
    solve those two equations for Vo and a

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    posted by Damon
  2. could you explain simpler . i get condfused easily im in 10th grade taking 12 grade classes its tough. any help will do

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    posted by ashley
  3. ok, you have 2 equations in your physics book for constant acceleration

    velocity = initial velocity + acceleration times time
    or
    v = Vo + a t

    position = initial position + initial velocity times time + half of acceleration times time squared
    or
    x = Xo + Vo t +(1/2) a t^2

    here I called Xo, initial position zero and x after 7 seconds was 80
    so
    80 = 0 + Vo (7) + (1/2) a (7)^2

    and I know final velocity at t = 7 is 15 but I do not know Vo
    so
    15 = Vo + a (7)

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    posted by Damon
  4. Obviously, you're in over your head. Maybe you should be taking 10th grade classes.

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    posted by Observer
  5. They may have used different letters and so forth, but the equations are there in the book I am sure.

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    posted by Damon
  6. ashley got the function stuff ok and we will get this as well.

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    posted by Damon
  7. i know this . im doing well i just need a little help

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    posted by ashley
  8. thank you damon. i know we will

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    posted by ashley
  9. not me

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    posted by harambe

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