MY fucked up teacher cannot teach well

[Anonymous No.5200996]

My physics teacher gave a question about free fall and I cannot answer it. She did not tell us how to do it so I'm gonna depend on you guys.This is the problem my fucked up teacher gave
"A ball was thrown horizontally from a top of the building(122.5 m) with a initial velocity of 10 m/s. What is the final velocity? How long does it take the stone to reach the ground?"

Any help would be appreciated.

[Anonymous No.5201000]

You're a retarded idiot.

[Anonymous No.5201007]

Well, okay i wont spel out the solution out for you but ill show how its done

You have no friction, so the velocity on x will be constant
so
Vx= V0x
and
x= x0+V0x*t

while on y, there is downward acceleration, gravity (minus sign)
vy= v0y + (-g)*t
and the position for y is (remeber for the freefall vy0= 0)
y= y0+v0y*t -0.5*g*t^2

to find the time you need to find t for the final position

to find the velocity you need the final velocity on y and x (when it reaches the ground)

good luck

[Anonymous No.5201010]

>A ball was thrown
>How long does it take the stone

Also, blaming your teacher because you're incompetent and can't read three pages from a textbook nor find one of 1000 similar examples on the internets.

[Anonymous No.5201012]

>Also, blaming your teacher because you're incompetent and can't read three pages from a textbook nor find one of 1000 similar examples on the internets.

This.

OP, get your head out of your ass, you're the fucked up one.

[Anonymous No.5201026]

not horizontally i mean vertically

[Anonymous No.5201031]

"A ball was thrown vertically" my bad im sorry

[Anonymous No.5201035]

vy=sqrt(2gh)
vx=10m/s
vf=sqrt(vx^2+vy^2)
t=sqrt(2h/g)
do it

[Anonymous No.5201039]

>>5201026
same as
>>5201007
only instead of having v0y= 0 and v0x= 10m/s
you have v0y= 10m/s and v0x= 0

If you cant manage solving it with that go look up projection motion in google because we are not just going to give you the results

[Anonymous No.5201042]

^ can i use that formula? i have initial velocity here so im not sure if i can use that

[Anonymous No.5201050]

>>5201042
no you cant use
>>5201035
's because that was with initial velocity of x instead of y

use >>5201039

[Anonymous No.5201116]

x=x0+v0t+1/2at^2

[Anonymous No.5201125]

Newton
/thread

[Anonymous No.5201124]

how long it falls, solve for t
x=x0+v0t+0.5gt^2
final speed, solve for v
v=v0+gt
faggot

[Anonymous No.5201131]

>>5201039
This is a really simple approach.
U neglect the aerodynamical drag which is something like kv^2

[Anonymous No.5201151]

>>5201131
he isnt meant to use it anyway

[Anonymous No.5201153]

>High school kinematics
>Algebraic version of one of the simplest equations of motion
>Given the value of all but one variable
>Still can't solve it

No... CLEARLY it's your teacher's fault you don't know how to solve this problem.

[Anonymous No.5201180]

is it possible to have Vf and Vi both greater than 1?

[Anonymous No.5201185]

i mean is it possible to have Vf and Vi greater than 1 in free fall

[Anonymous No.5201187]

>>5201185
are you fucking retarded

[Anonymous No.5201191]

>>5201187
We've already established that this is the case

[Anonymous No.5201196]

>>5201185
No, velocity cannot exceed 1 m/s (the speed of light). This is one of the basic postulates of quantum mechanics.

If you're getting a velocity greater than 1 go back and check your work.

[King homo Lettuce Be Hardcore swami !!oErdTjy2ja5 No.5201198]

>>5200996
u=10
v=v
a=9.81
s=122.5
t=t

v=sqrt(u^2+2as)
t=(v-u)/a

[Anonymous No.5201242]

>>5201196
This, also remember to check for time dilation - it's really easy to forget but can throw your answer way off.

[Anonymous No.5201249]

>>5200996

a) <span class="math">v=\sqrt{10^{2}+(2\cdot -g \cdot -122.5)}= 50.0\:ms^{-1}\;(3\:s.f.)[/spoiler]

b) <span class="math">-122.5=10t+\left (\frac{1}{2}\cdot -g\cdot t^{2} \right )\;\Rightarrow\; t=6.12s\;(3\:s.f.)[/spoiler]

[Anonymous No.5201251]

>>5201249

-50m/s

[Anonymous No.5201266]

^thank you so much

[Josh No.5201286]

Very basic suvat which you are both incompetent and lazy for not being able to look in a book and solve, you aren't going to get any smarter getting an answer off 4chan which i'm surprised you were given

[Anonymous No.5201333]

^dude i just want to learn

[Anonymous No.5201345]

Is the rock being thrown in a vacuum?
Is the building made out of neutronium?
If there is atmosphere, is the density uniform?
Please specify

[Anonymous No.5201365]

>>5201333
>thanks only the person who posts the answer >explicitly instead of those who have explained >how to do the thing

get out of school now and start cleaning toilets because that is all you are ever going to be good at

[Anonymous No.5201367]

>>5201333
No, you fucking don't. If you wanted to learn you wouldn't be asking people to do your fucking homework for you and blaming your incompetence on your fucking teacher.

[Anonymous No.5201383]

i asked this question just to make sure i am correct. dude no need to be angry

[Anonymous No.5201387]

>>5201383
Lie to yourself if it comforts you but don't lie to us.

[Anonymous No.5201399]

>mfw taking dynamics and thinking back to how easy it was in HS
>always given everything except one unknown
>now always get at least 3 equations and 3 unknowns, no matrix solver allowed on test etc.

[Anonymous No.5201439]

>>5201153
The teacher didn't say where the ball was thrown from though. For all op knows it could have been frown from a building on mars.