help do this for me what is what in suvat and solve
#kinematics as easy
languid agate
s=ut+1/2at²
find a
then use v=u+at
as it moves to A, it will have negative displacement
but since your acceleration will also be negative, it'll be positive
@shy stag
shy stag
can u write the whole thing out for me 🙏 im super confuzzled
languid agate
you move to B
languid agate
so why are we finding a first
how else are you gonna find the velocity at A
shy stag
Well can i show u what i initially did
languid agate
sure
shy stag
languid agate
,rotate
deep micaBOT
languid agate
yeah you can't do this
shy stag
why
languid agate
the velocity at B is your initial velocity for your A calculation
but you're trying to find the velocity as it passes A
that's Va
Vb=Ua
shy stag
What so because the acceleration is constant we find that first as it will be the same throughout and then find the initial velocity
languid agate
What so because the acceleration is constant we find that first as it will be th...
you already know the initial velocity
initial velocity = velocity at B
you dont know the final velocity, which is the velocity at A
for these sorts of problems you have to do this every time
languid agate
No but your going from a to b
the question said as it passed A
so if we worked backwards, say from B to A
we already know what the velocity was at B
we don't know the velocity at A
and we can find the acceleration
because we have the distance
shy stag
I’m actually mega confused maybe bc it’s late
Can i send u another
How do u do part a @languid agate
languid agate
How do u do part a <@1235702017394217032>
what's the displacement at rest?
shy stag
0
languid agate
you can now do (a)
languid agate
but surely it could be at different points whilst resting
you can't have negative time
you will probably get a positive and negative answer
languid agate
Wait and cause it says deceleration do i use -3
yes
languid agate
long day
shy stag
languid agate
I found ur issue
you have a double negative
0=12t-1/2(3)t²
(3/2)t²-12t=0
t(3/2t-12)
t=0 or t=12×2/3
t=8
languid agate
how is it 4
languid agate
U said use -3
you have to...or else you get imaginary roots
if both are positive
you essentially get
shy stag
Huh
languid agate
(3/2)t²+12t
shy stag
U didn’t use -3
languid agate
I did
languid agate
0=12t-1/2(3)t²
negative sign is on the outside
I can write it 0=12t+1/2(-3)t² if you want
shy stag
Wait so 12 is u not v?
shy stag
Ohh
languid agate
so 12 is the initial velocity
languid agate
yeah ive been stupid
yeah rest assumes v=0
been a long day
yeah im an idiot you can't even use a quadratic