i need help converting 230m in 85seconds to m/s pls help

[dark root]

230/85

[boreal raft]

is that..it

[dark root]

yes

[boreal raft]

can u also help me with this plz

[dark root]

1m/s = 3.6km/h

[boreal raft]

huh

[dark root]

thats the conversion rate

[boreal raft]

oh

okay

so...what do i do

[dark root]

1m/s = 3.6km/h, so her speed in km/h is just the speed you found for m/s multiplied by 3.6

[boreal raft]

OHHH

THANKU

SORRY IM REALLY DUMB IN SCIENCE 😭

[dark root]

if you read out the units given to you and try to make sense of what its asking in english it might help

which is probably a rare piece of advice to get in a math server

like when you were looking for m/s

[boreal raft]

oh wow u just called me stupid in a diff way

LMAO

[dark root]

m/s really just means how many (metres per second) you are travelling at

[boreal raft]

idk what to put for the 'u' part

[dark root]

the car is travelling 8m/s

or 8 metres every second

she travels for 1.5 seconds before hitting the brakes at all

ur gonna be looking for the distance travelled in that time frame

to subtract from the initial 20 m between the car and the person

[boreal raft]

wha

[dark root]

distance = velocity x time

so find 8 m/s x 1.5 seconds

thats step 1

[boreal raft]

okay

i got it

the distance = veloc x time''

[dark root]

ok so what number did u get?

[boreal raft]

i got 12

@dark root

[dark root]

ok so the student was 20 metres away at the start

now you moved 12 metres closer

whats the new distance

?

[boreal raft]

8

[dark root]

ok and ur formula is v = u + at

she slams on the brakes and stops

[boreal raft]

so v = u + at
v = [8m] + [-14 m/s^2] x [1.5]

right...

[dark root]

velocity = 0 when she stops

[boreal raft]

how tho?

[dark root]

are u moving when u stop?

[boreal raft]

ON HELP N

NO

[dark root]

ok so v = u + at

ur looking for the time she takes to stop

so v = 0 .... 0 = 8 + -14 x t

[boreal raft]

what does the 0....0 mean

[dark root]

no meaning

i just used it to kind of say therefore

[boreal raft]

oh okay

so 0 = 8 + -14 m/s ^2

[dark root]

0 = 8 + -14m/s x t

and ur looking for the unknown t

so u can subtract 8 to move it to the other side

-8 = -14m/s multiplied by some sort of time

-8/-14m/s = t

[boreal raft]

the a) part of the questions says 85 seconds

idk if that applies but

[dark root]

nooo when you're this deep into a physics problem u can just isolate a variable

if u have all parts of an equation besides one

[boreal raft]

oh okay

[dark root]

and u set it equal to zero

u can use algebra to move everything to the opposite side of the equation besides the unknown

and then u inherently have figured out the unknown

[boreal raft]

so i just leave the 14 m/s^2 alone

[dark root]

nope

-14m/s^2 is multiplied with ur time

time is the unknown

[boreal raft]

oh....

[dark root]

so -8 = -14m/s^2 x time

therefore

if u divide by 14 m/s^2 on both sides of that equation...

ur left with the time it took alone on one side

and -8/-14 on the other side

right?

[boreal raft]

yes

[dark root]

you'd agree that -14/-14 = 1

and 1 x time is just equal to time

[boreal raft]

oh my god physics is so hard

[dark root]

hahaha

[boreal raft]

and for that

does the answer prove she will hit the student

when she slams her breaks

[dark root]

ok so tell me what answer u get

write -8/-14 = t

and figure out what -8/-14 equals

(calculator)

[boreal raft]

i got -22

wait no

4/7

and 0.57 (rounded)

@dark root

[dark root]

ok 👌

[boreal raft]

so is that it

is that my answer

[boreal raft]

@dark root COME BACK

[dark root]

Yes u found the time it took to slow down after she slammed the brakes

[boreal raft]

hi

@dark root

can u help me with this

please

A ball is dropped from the top of a building. After 2 seconds, it’s velocity is measured to be 19.6 m/s. Calculate the acceleration for the dropped ball.

when i did it in class my teacher used this method

WAIT