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carolinar7

  • one year ago

a ball is thrown straight upward with a speed of 20 m/s with what speed does the ball hit the ground?

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  1. carolinar7
    • one year ago
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    and i have another one the total time of all remains in the air is 14 seconds. a)with what speed was the ball thrown upwards b)what is the maximum height reached by the ball

  2. carolinar7
    • one year ago
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    I say 20m/s for the first one

  3. carolinar7
    • one year ago
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    |dw:1442888398239:dw|

  4. anonymous
    • one year ago
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    at highest point speed=0m/s v=u+gt 0=20-9.8 t t=20/9.8=2s approx time of flight=2*2=4s

  5. anonymous
    • one year ago
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    yes you are correct.

  6. carolinar7
    • one year ago
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    what is the 0 in 0=20-9.8 t

  7. anonymous
    • one year ago
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    speed at highest point.

  8. carolinar7
    • one year ago
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    what about the second question?

  9. carolinar7
    • one year ago
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    ok

  10. anonymous
    • one year ago
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    forsecond take t=14/2=7 seconds and proceed as i have done.

  11. carolinar7
    • one year ago
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    idk

  12. carolinar7
    • one year ago
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    would the acceleration be + or-

  13. carolinar7
    • one year ago
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    + right?

  14. anonymous
    • one year ago
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    0=u-9.8*7 u=?

  15. anonymous
    • one year ago
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    when going upward g is -ve,when going down g is +ve.

  16. carolinar7
    • one year ago
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    why are you using half the time why not the whole 14 seconds?

  17. anonymous
    • one year ago
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    |dw:1442899612575:dw|

  18. anonymous
    • one year ago
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    |dw:1442899702335:dw|

  19. carolinar7
    • one year ago
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    oh so would it be 69 m/s

  20. carolinar7
    • one year ago
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    for a)

  21. carolinar7
    • one year ago
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    oh and is it + or - accelaration?

  22. anonymous
    • one year ago
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    69 m/s approx or68.6m/s

  23. carolinar7
    • one year ago
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    why is it - acceleration

  24. carolinar7
    • one year ago
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    if its going upwards

  25. anonymous
    • one year ago
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    \[v^2-u^2=2as\]

  26. anonymous
    • one year ago
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    because it is retardtion and speed is decreasing.

  27. carolinar7
    • one year ago
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    and for be is it 48x10 m

  28. carolinar7
    • one year ago
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    ?

  29. carolinar7
    • one year ago
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    b) 48x10 m?

  30. anonymous
    • one year ago
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    \[0^2-68.6^2=-2*9.8*h\] \[h=\frac{ 68.6*68.6 }{ 2*9.8 }=7*34.3=240.1m\]

  31. carolinar7
    • one year ago
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    a stone is dropped from 150 meters high .initial velocity is zero. a)with what speed does the stone strike the ground b)how long is the stone in the air c)sketch a position vs time graph for the stone

  32. anonymous
    • one year ago
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    \[v^2-u^2=2gh\]

  33. carolinar7
    • one year ago
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    This is what I did \[\frac{ 69 m/s +0 m/s}{ 2 }(14 s) =Deltax\]

  34. carolinar7
    • one year ago
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    for the second question part b

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