Question

A 55.0-g Super Ball traveling at 29.0 m/s bounces off a brick wall and rebounds at 19.5 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 3.40 ms, what is the magnitude of the average acceleration of the ball during this time interval?

Answer 1

do you know anything about impulse?

Answer 2

i literaly just started physics

Answer 3

look in your book and give me an attempt at a problem with impulse let me see where your at

Answer 4

the first page impulse is started is pg 253. we have read to only 30. but this what it says...

Answer 5

delta(t) = tf-ti

Answer 6

and also vetors

Answer 7

oh you can just do it this way

Answer 8

i think it is vi-vf/t maybe the t is squared to. ill have to look in my old book real fast. i donno where it is.

Answer 9

impluse=mv

Answer 10

im just talking about, the magnitude of the acceleration. i was getting ahead of him

Answer 11

can just take the initial - the final velocity/2 to get acceleration

Answer 12

ill try that

Answer 13

Douglas after your done here can you please help me with my phy question referring to work?

Answer 14

Yes, impulse is force x time, but not needed here.
Acceleration is change in velocity divided by time:

acc = (29 -(-19.5))/ (3.4x10^-3) = (48.5/3.4) x 10^3

(

Answer 15

ya, i donno why i put 2 the second time i typed that. lol

Answer 16

i got .0034

Answer 17

so we done here?

Answer 18

? for the numerator? or the answer

Answer 19

or is it positive ^3?

Answer 20

then it would be 14264.7

Answer 21

that is what i got.

Answer 22

i submitted it and it was wrong :(

Answer 23

do you have to use sig figs?

Answer 24

this is really hard!

Answer 25

sig figs?

Answer 26

ha really head. you should go see my question

Answer 27

nevermind then lol is there a rounding rule on the problem. i looked at your question raffle. i am not as smart as you lol.

Answer 28

i am not very smart either... that is why i am asking for your help bro

Answer 29

im just starting give me a little break! lol

Answer 30

its fine man, its hard when i dont know what you know.

Answer 31

Haha josh just giving you ahard time=P

Answer 32

i never liked word problems in math and then i got to this class.... lol

Answer 33

i know someone that could help, but he isnt on this site.
and all physics is word problems, get used to it lol.

Answer 34

calc1-2 passed too

Answer 35

isnt it the least bit interesting knowing about stuff in the universe, or around you that is moving or sitting still, what is really going on

Answer 36

i think the universe is very interesting in of it self

Answer 37

ive taken astronomy classes just for fun

Answer 38

if you havent figured this problem out before i get back ill see what i can do to get you the right answer. i bet your not rounding to the right decimel place.

Answer 39

nice, wish i had time to take some astronomy classes for fun

Answer 40

That answer should have been close to a= 15,000 m/s^2.

Answer 41

it was one of those "required" classes

Answer 42

it was close to that 142xx im thinking he is inputting into masteringphysics or something that wants it to the .xxx decimal place.

Answer 43

i bet. kind of silly to have online questions like this. but what do i know

Answer 44

Why didn't the acc=deltaV/delta t work?

Answer 45

thanks for your help guys.

Answer 46

you good?