How do you work out the deceleration on a graph?

Question

For instance: a speed of 40m/s that goes down to 10m/s in 20 seconds?

Answer 1

rise over run
where you take the value of y and divide it by x ( y / x )
so the change in y is -30
and x is 20

acceleration is measured in m/s/s or m/s^2

so, 40-10 = 30m/s
the total velocity change is 30m/s
divide that over 20s
= 1.5m/s

since it's a deceleration,
(it is a negative) acceleration = -1.5m/s^2
or
deceleration = 1.5m/s^2

Answer 2

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RE:
How do you work out the deceleration on a graph?
For instance: a speed of 40m/s that goes down to 10m/s in 20 seconds?

Answer 3

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The height from which the person is dropped is h=119 m. determine the point of time in the person's fall at which the brakes begin acting. Let that point of time be t'. The slope of the curve at that point of time will yield the initial velocity u determine the point of time when the person completely stops owing to the brakes. Let that point of time be t ". t "-t' = t is to be calculated. The final velocity v of the person is 0. use v = u + at Let 'd' be the decelaration brought by the brakes. decelaration is opposed by acceleration due to gravity, g. so, eqaution becomes: v = u + (d-g)t 0 = u + (d-g)t u = -(d-g)t u = -dt +gt d= (gt - u)/t This is the solution to the problem as I understood it. You will probably get a better idea if you look at the graph. All the best!

Answer 4

very simple

let time be on x-axis
and speed be on y-axis

now at t=0 mark v=40
at t=20 mark v=10

join it with a ruler


ur graph ready my dear!!!!!


find out the slope of this line i.e (10-40)/20 = -1.5m/s^2

minus sign indicates deceleration.

Answer 5

At the braking phase the train would continue falling lesser height in a certain time until it stops falling any height and comes to a halt.. So it would be a curve . Something like this. height !......# !......# !.......# !........# !.........# !..........# !...........# !.............# !................# !....................# !..........................# !................................# !______________________#__________ time ----> Hope it Helps : )