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.

physics i suck  harambe, Tuesday, September 13, 2016 at 5:13pm
not me
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