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pratyush5

  • 3 years ago

A body looses half of its velocity while penetrating 3 cm into a wooden block, then how much will it penetrate more before finally coming to rest. Please explain

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  1. pratyush5
    • 3 years ago
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    @ashwinjohn3 @yrelhan4 @uri

  2. pratyush5
    • 3 years ago
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    i have got the answer but i want to know a proper method

  3. yrelhan4
    • 3 years ago
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    newtons law of motion will do it for you!

  4. pratyush5
    • 3 years ago
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    i used v^2 - u^2 = 2as

  5. pratyush5
    • 3 years ago
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    i just need to know what should i take for acceleration or should i ignore it

  6. ashishthomas7
    • 3 years ago
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    u must find the acceleration dude....

  7. ashwinjohn3
    • 3 years ago
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    Ok....Acceleration is negative since it is slowing down.....

  8. pratyush5
    • 3 years ago
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    ya sure

  9. ashishthomas7
    • 3 years ago
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    here v=u/2,and use the equation v^2=u^2-2as

  10. ashishthomas7
    • 3 years ago
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    then u will get accelration

  11. ashishthomas7
    • 3 years ago
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    then finally equate v=0,a=obtained from above and find s!!!

  12. ashishthomas7
    • 3 years ago
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    since here the question asked is "how much more will it penetrate" initial velocity=u/2...

  13. pratyush5
    • 3 years ago
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    i am getting a= -u^2/8

  14. pratyush5
    • 3 years ago
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    is dat right ?

  15. yrelhan4
    • 3 years ago
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    yup..

  16. ashishthomas7
    • 3 years ago
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    yup....

  17. pratyush5
    • 3 years ago
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    there fore the equation for finding "s" should be|dw:1359144797548:dw| right

  18. pratyush5
    • 3 years ago
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    so i get s=1 cm

  19. ashishthomas7
    • 3 years ago
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    i got that too...

  20. pratyush5
    • 3 years ago
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    correection |dw:1359144893116:dw|

  21. pratyush5
    • 3 years ago
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    thnku all

  22. ashishthomas7
    • 3 years ago
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    your welcome....

  23. yrelhan4
    • 3 years ago
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    yes.. i was wondering whats wrong. so s=4cm. it penetrates 1cm more.

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