OCR FSMQ Additional Maths 6th June 2016 Official Thread

OP=400-25t and OQ=100-20t

Use Pythagoras to find length PQ (xm) which gave something like 170,000-24,000t+1025t^2.

Differentiate this and set it equal to 0 to find the minimum value of t which you the substituted into the equation above to get 171.8m.

Whyyyyy ahah I started doing that then thought it was wrong so tried something else n left it im without doubt getting a u

What does everyone think the grade boundaries will be? I think I didn't answer a round 25 marks and I want an A:/

Like 400-25t, and the 100-20t, I got the answer to be 170 metres as the smallest length of X. Don't know if it's right.

i got 172 m but the equations I got were 400 - 25/2 t and 100 - 10t using the formula s = u+v/2 x t

They gave it, we had to find the curve equation

The answer is 400m:
S = ut + ½ at^2
Car A: = 0(t) + ½(1.5) t^2
= .75t^2
Car B: = 0(t) +½ (2) t^2
= t^2
.75t^2 +100 = t^2
100= ¼ t^2
t= 20 seconds
S = ut + ½ at^2
= 0(20) + ½ 2(20)^2
=400m

what did everyone get for t in the car and train question? started off decently and then i flopped it lol

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Welp.
GG, OCR. You've successfully managed to piss me off in ways I did not think were imaginable.
Did all of the past papers, thought, 'yeah, this isn't so bad, I'm ready!'
After doing the test, I feel like I've wasted a METRIC S***TON of time revision for a test that is going to make me cry to sleep.
Just... so many questions where I was completely baffled.
Additional Maths? Additional B***S***.

do you know how many marks that whole question was?

When you spend half the exam making sure your deltas dont look like 8's.

what was the angle of the triangle? and the shortest length of AB?