Physics Question
 

My mind has just gone blank and I've forgotten how to do this, any help ?

Find the Distance travelled by an object accelerating at 0.4ms^2 over 50 seconds (at the end of the 50 seconds the object is travelling at 20m/s)

Halp my failing brain. I know an object with a constant speed it would be D=ST vut for an accelerating object Im not sure what I should do.

v final = v initial + at
20 = v initial + 0.4(50)
v initial = 0 m/s

d = v initial + 0.5at^2
d = 0 + 0.5(0.4 m/s^2)(20)^2
d = 80 m

I thought it was

Distance = 1/2Acceleration multiplied by t^2
Not
Initial velocity+1/2a(t^2)

Then again my Physics teacher is crap. He hasnt even taught us this :/

Wait just had another look through my exam book and got the equation

d=ut+0.5at^2
which with the Numbers was
D=(0*50)+0.5(0.4*50^2) = 500metres...

And to I also used the other equation the book suggested which was:
d=((u+v)/2)t which again equaled 500.

Triumph...Got a Physics question wrong ?

d = vt - 0.5at^2
d = 20 x 50 - 0.5 x 0.4 x 50^2 = 500m

Wow that's embarrassing.

I did it two ways and got 80 m and 500 m, the second way was:

(v final)^2 = (v initial)^2 + 2ad
d = [(v final)^2 - (v initial)^2]/2a
d = (20)^2/2(0.4)
d = 500 m

I figured I was wrong, and picked the smallest answer... in my defense I was on the phone and was working on economics, lmao

Econ > Physics.

Wtf is all this? @_@

-Dies-

You can only do that because in Econ, you start off by saying "Let's assume Economics is better than Physics..."

Thank gawd we dun study this here. @__@

9th grade is easy. x_x

We didn't have a specific Physics class before 11th grade, here. We had science-related classes, but not pure physics. We just didn't have the math for it yet.

No worries :D

Sparky, I'm in Y10 which I think is the equivalent of 10th Grade. Just you wait boy-o

Ahh Physics.. I use to enjoy physics coz I had an awesome Physics tutor when I was in High School..

He was 1000000x better than my school teachers...

I never thought I'd say this but, I miss high school physics Dx

The demand for Econs is inelastic whereas Physic is elastic.
When the toughness of Physics goes up, quantity of students taking physics drops more than proportionately, following the Law of *insert w/e is here*, ceteris paribus.

λ=λ'-h(1-cosϕ)/mc

okay okay, no need to prove yourself o.o

Am I the only person without any physics experience here? Any Chem/Bio?

Only high school level lulz

Only 2/3 through high school. :)

I didn't take Physics in high school either.

Well the way school works in England is different from US I believe, we have 7(or 7.5) years of Primary school, then move onto 5 years of High School (3 years into this we do our GCSE options) then 3 years of college and so on.
At the start of Y10 (3 years into HS) we pick our GCSE options, 5 of them we HAVE to do and we get to pick up to 3 for other sujects I think (the number varies)
We have to have:
-English (Literature and Media)
-Maths
-Science (Biology, Physics and Chemistry)
-Religeous Education (RE)
-Physical Education (PE)

In high school, for the first 4 years, we've always had "science" which is a combination of bio, chem and phy... it's not until the last 2 senior years that we pick specific subjects (doesn't even have to be science..) for our university entry exam..

the only subject we HAVE to do in the senior years is English.. keke