Posted by **ashley** on Saturday, January 12, 2008 at 6:46pm.

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 ?

- physics i suck -
**Damon**, Saturday, January 12, 2008 at 6:53pm
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

- physics i suck -
**Damon**, Saturday, January 12, 2008 at 7:05pm
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)

- physics i suck -
**Damon**, Saturday, January 12, 2008 at 7:08pm
They may have used different letters and so forth, but the equations are there in the book I am sure.

- physics i suck -
**Damon**, Saturday, January 12, 2008 at 7:09pm
ashley got the function stuff ok and we will get this as well.

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