APPLIED MATHS LEAVING CERT 2013

qwertboy2 · 2013-09-07 12:02:01

in the leaving cert 2013 applied maths exam marking scheme,it says that the time if the first part of the journey is half(t-t1) ,how do you get that/why?

07-09-2013 01:02PM

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qwertboy2

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in the leaving cert 2013 applied maths exam marking scheme,it says that the time if the first part of the journey is half(t-t1) ,how do you get that/why?

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#2 07-09-2013 01:08PM

TheBody

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qwertboy2 wrote: »

in the leaving cert 2013 applied maths exam marking scheme,it says that the time if the first part of the journey is half(t-t1) ,how do you get that/why?

What question number and ordinary or higher level?

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#3 07-09-2013 01:31PM

Peregrine

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You're going to have to be a bit more specific..

But I assume you're talking about Q1 b in Higher Level?

It says the total time is t seconds and the time spent travelling at a speed of v ms-¹ is t1.

That means the sum of the time spent accelerating and the time spent decelerating is (t-t1).

Its acceleration from 0 to v was f ms-² and its deceleration from v to 0 was -f ms-² meaning the time spent accelerating was the same as the time spent decelerating so you divide (t-t1) by two.

t = total time
t1 = time spent at constant velocity
t-t1 = sum of the time spent accelerating and the time spent decelerating.
½(t-t1) = the time spent accelerating
½(t-t1) = the time spent decelerating.

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#4 07-09-2013 01:34PM

decisions

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^^^ this, and for future reference there is an applied maths thread here.

And would I be right in assuming this was you too?

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