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natasha.aries

A student tosses a 2 kg ball into the air 4 meters above his hand. Ignoring air friction, what will be the magnitude of the velocity of the ball when it returns to his hand? A 1 m/s B 2 m/s C 8 m/s D 10 m/s

  • one year ago
  • one year ago

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  1. VeritasVosLiberabit
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    \[v _{f}^{2}=v _{i}^{2}+2a \Delta x\]

    • one year ago
  2. natasha.aries
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    but you dont have any velocity

    • one year ago
  3. VeritasVosLiberabit
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    hmm but actually I'm getting 8.85 as my answer

    • one year ago
  4. natasha.aries
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    would vf be 0?

    • one year ago
  5. cesckay
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    mgh=0.5mv^2

    • one year ago
  6. cesckay
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    potential energy = kinetic energy

    • one year ago
  7. natasha.aries
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    hmm ill try both equations!

    • one year ago
  8. cesckay
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    ans= 8.85

    • one year ago
  9. VeritasVosLiberabit
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    they give the same answer so I think something is missing.

    • one year ago
  10. natasha.aries
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    wait so it doesnt matter which equation?

    • one year ago
  11. VeritasVosLiberabit
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    no both give the same result.

    • one year ago
  12. VeritasVosLiberabit
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    but Im not sure if the answer is correct since 9 isn't listed.

    • one year ago
  13. natasha.aries
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    okay would vf = 0 in @VeritasVosLiberabit

    • one year ago
  14. VeritasVosLiberabit
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    vi = 0 you are trying to find vf

    • one year ago
  15. natasha.aries
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    the answer is supposed to be 8 so i guess thats close right?

    • one year ago
  16. natasha.aries
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    oh hah yeah my bad

    • one year ago
  17. VeritasVosLiberabit
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    hmm but you dont round downward

    • one year ago
  18. VeritasVosLiberabit
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    if it asks for 1 sigfig the answer should be 9.

    • one year ago
  19. natasha.aries
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    yeah im a little iffy about that but i can try asking my teacher that one tomorrow morning!

    • one year ago
  20. cesckay
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    either way the question might be wrong taking g= 9.81... my best answer could be 10 :)

    • one year ago
  21. natasha.aries
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    thanks you guys! ill ask my teacher to verify it

    • one year ago
  22. VeritasVosLiberabit
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    you're welcome.

    • one year ago
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