Answer:
x2=−8(y−2)
Step-by-step explanation:
Parabola is a locus of a point which moves at the same distance from a fixed point called the focus and a given line called the directrix.
Let P(x,y) be the moving point on the parabola with
focus at S(h,k)= S(0,0)
& directrix at y= 4
Now,
|PS| = √(x-h)2 + (y-k)2
|PS| = √(x-0)2 + (y-0)2
|PS| = √ x2 + y2
Let ‘d’ be the distance of the moving point P(x,y) to directrix y- 4=0
- d= |ax +by + c|/ √a2 + b2
- d= |y-4|/ √0 + 1
- d= |y-4| units.
equation of parabola is:
- |PS| = d
- √ x2 + y2 = |y-4|
Squaring on both sides, we get:
- x2 + y2 = (y-4)2
- x2 + y2 = y2 -8y + 16
- x2 = - 8y + 16
- x2 = -8 ( y - 2)
This is the required equation of the parabola with focus at (0,0) and directrix at y= 4.
What is a hundred? A hundred would be 846. What does it mean to round to the nearest hundred pounds? It's to make the number end with 00, so 100, 200, 300. If you have 467, you'd round it to 500, because that's the closest hundred it can be rounded to. So the answer would 25,800.
50%
i think
tell me if i got it right...
Answer:
-3.125m/s^2
Step-by-step explanation:
Average acceleration = v-u /t
That is initial final velocity v minus initial velocity u divided by the time t In seconds .
From the question,
v =9.5m/s
u =12m/s
t =0.8 secs
Using the above formula,
We have
average a = 9.5 -12 /0.8
= -2.5/0.8
= -3.125m/s^2
Negative answer indicates that the train was decelerating
