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anonymous

  • one year ago

A volleyball is thrown up in the air with initial velocity of 8.2m/s. How long does it take the ball to reach maximum height? help please!

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  1. zephyr141
    • one year ago
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    do you know the kinematic equations?

  2. zephyr141
    • one year ago
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    if you don't just google them.

  3. anonymous
    • one year ago
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    well i was given 3 to choose from. and i know im looking for the time. so im going to assume i have to use either, g=vf-vi/ t or y= vi(t)+1/2 (g) (t)^2

  4. zephyr141
    • one year ago
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    \[1:d=v_0t+\frac{1}{2}at^2\]\[2:v^2=v_0^2+2ad\]\[3:v=v_0+at\]\[4:d=\frac{v_0+v}{2}t\]

  5. zephyr141
    • one year ago
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    i would use number 3.

  6. anonymous
    • one year ago
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    oh then idk what i just gave you because thats like completely different but ok so how would i get t by itself

  7. zephyr141
    • one year ago
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    \[0=8.2+(-9.8)t\]\[-8.2=(-9.8)t\]\[\frac{-8.2}{-9.8}=t\]\[0.84s=t\]

  8. zephyr141
    • one year ago
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    subtract 8.2 from both sides. then divide both sides by (-9.8) to isolate t.

  9. zephyr141
    • one year ago
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    the first equation you gave me looks a lot like equation 4 that i gave you.

  10. anonymous
    • one year ago
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    oh ok

  11. anonymous
    • one year ago
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    so then how do i know what the total time was that the ball was in the air?

  12. zephyr141
    • one year ago
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    well we found the time it took to get up to it's max height. assuming that nothing changes in it's descent then it should be the same amount of time on the way back down. |dw:1444277213628:dw|

  13. zephyr141
    • one year ago
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    so you can figure that one out. you can do it!

  14. anonymous
    • one year ago
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    lol so i just add them then? right?

  15. zephyr141
    • one year ago
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    yep. that's the total time in flight. of course if the final resting point is any number of feet/meters or whatever measurement lesser or greater than it's original values then the problem gets a little harder.

  16. anonymous
    • one year ago
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    ahhhh i got you now. thanks!

  17. zephyr141
    • one year ago
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    don't forget to medal. lol. good luck on any future problems.

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