anonymous
  • anonymous
Arianna kicks a soccer ball off the ground and in the air with an initial velocity of 42 feet per second. Approximately, how long does it take until the soccer ball hits the ground again?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
Arianna kicks a soccer ball off the ground and in the air with an initial velocity of 42 feet per second. Approximately what maximum height does the soccer ball reach? I think this can not be solve due to lack of data.
anonymous
  • anonymous
lol!
anonymous
  • anonymous
Here's the for choices a 1.3 secs b 2.6 secs c 16.0 secs d 27.6 secs

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anonymous
  • anonymous
some options are available or not
anonymous
  • anonymous
^^^ i put them
anonymous
  • anonymous
kk
lgbasallote
  • lgbasallote
use the formula to get maximum height first \[S_2 - S_1 = V_1 t + \frac12 at\] s2 is the maximum height = not given s1 is initial height = 0 V1 is the initial velocity = 42 a = -9.8 m/s^2 t = time =not given
lgbasallote
  • lgbasallote
obviously that wont work ;)
anonymous
  • anonymous
you have to deal with two components of the balls motion ie vertical and horizontal
lgbasallote
  • lgbasallote
use another formula \[V_2 = V_1 + at\] v2 is final speed which will be 0 because v = 0 at max height v1 = 42 a = -9.8 now solve this... \[0 = 42 -9.8t\] \[9.8t = 42\] can you solve for t?
anonymous
  • anonymous
No this is for my bro i dont know how to
lgbasallote
  • lgbasallote
hmm if you look closely..that last step is just algebra...
anonymous
  • anonymous
o ok thanks for the help guys
lgbasallote
  • lgbasallote
btw...you need to multiply the time you get from that by 2 because the one we got was just the first half
anonymous
  • anonymous
I got 8.6 and thats not one of the answers.

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