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anonymous

  • one year ago

hai guys, anyone who can help me.. i have a hard time figuring the answer of it because it seems the given is not correct but i don't know if my feeling is right. I had answered the same questions like stated below but this, why i cant get it.

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  1. anonymous
    • one year ago
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    an object moves along a straight path at a speed v(t)=4t^2+3t+2 in m/s, where t=time in seconds. find the distance travelled after 4 seconds?

  2. welshfella
    • one year ago
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    you need to find the distance so you have to integrate

  3. anonymous
    • one year ago
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    the choices are: a) 112.56 m b) 135.68 m c) 117.33 m d) 125.75 m

  4. anonymous
    • one year ago
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    i already derive this v(t)=4t^2+3t+2 and plug in t=4

  5. anonymous
    • one year ago
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    u have o integrate it

  6. anonymous
    • one year ago
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    nd hten plug in t=4

  7. welshfella
    • one year ago
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    can you integrate the expression

  8. anonymous
    • one year ago
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    ok wait

  9. anonymous
    • one year ago
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    whats the limit? 0 and 4?

  10. anonymous
    • one year ago
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    write v in terms of dx/dt and then integrate

  11. anonymous
    • one year ago
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    yes

  12. welshfella
    • one year ago
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    |dw:1433684988494:dw|

  13. anonymous
    • one year ago
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    oooh got it

  14. anonymous
    • one year ago
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    the answer is 117.33

  15. welshfella
    • one year ago
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    right!

  16. anonymous
    • one year ago
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    i thought it must be derive

  17. anonymous
    • one year ago
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    thats why i cant get the answer.

  18. welshfella
    • one year ago
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    derivation will give you acceleration ( rate of change of velocity)

  19. anonymous
    • one year ago
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    so questions like this must be intergrated?

  20. welshfella
    • one year ago
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    if you are given velocity you integrate to get distance yes

  21. welshfella
    • one year ago
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    - between the required limits

  22. anonymous
    • one year ago
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    ok thanks a lot :-)

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spraguer (Moderator)
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