Question

You are standing at the foot of the Bank of America building in San Francisco, which is 52 floors (237 m) high. You launch a ball straight up in the air from the edge of the foot of the building. The initial vertical speed is 70 m/s.
a. How high up does the ball go?
b. How fast is the ball going right before it hits the top of the building?
c. For how many seconds total is the ball in the air?

Answer 1

I'm so confused I don't understand how to use the equations, or plug numbers into the equations.

Answer 2

Okay! So, lets look at
Part A

Answer 3

@summerncaela

Answer 4

So how high did the ball go up?

Answer 5

@Lowkey.S i havve no idea??

Answer 6

Use conservation of energy. The ball rises to a maximum height H such that
gH = Vo^2/2

\[H=(1/g)\times(1/2)\times Vo^2 = 250 m\]

Vo is the initial velocity that it is thrown.

Answer 7

so Vo is 70 m/s right? @Lowkey.S

Answer 8

Yes you know why right?

Answer 9

well becaause its the velocity?
and Vo is velocity right? @Lowkey.S

Answer 10

No Vo is Volume

Answer 11

then why did you put Vo as 70 m/s? @Lowkey.S

Answer 12

what did you plug in to get 250?

Answer 13

Okay
let me repharase this again

Answer 14

Okay the question " The initial vertical speed is 70 m/s." is that a answer

Answer 15

Okay anyways i have to do this fast Part B

Answer 16

I dont understand how you got 250 lmao @Lowkey.S

Answer 17

Have you not read your lesson?

Answer 18

You should go back read your lesson

Answer 19

my teacher makes 0 sense, he is from Lebanon and everyone has a hard time comprehending @Lowkey.S

Answer 20

hmm i see

Answer 21

you have serious zero sense of this lesson

Answer 22

Nope @Lowkey.S

Answer 23

wait 2 min

Answer 24

alright, all i really know is that there are 3 main equations, and you have to pick a certain one to find the answer you need, but i dont which equation to use or how to plug in the numbers @Lowkey.S

Answer 25

@zepdrix can you help I don't know what his talking about anymore...

Answer 26

@Lowkey.S i figured it out its fine

Answer 27

you sure?

Answer 28

kinda but yeah @Lowkey.S

Answer 29

A and B and C?

Answer 30

For part a only

Answer 31

you dont always have to tag my name lol i can see it

Answer 32

the whole thing, i'm fine and oh ok lol

Answer 33

okie then! Good LUCK!