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haridas_mandal

  • 3 years ago

Minimum velocity of a projectile is 20 m/s when a body is projected at an angle of 60 degree with the horizontal .Find the vel of projection....20 m/s,10 m/s,30 m/s or 40 m/s?

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  1. JamesWolf
    • 3 years ago
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    so you want the horizontal velocity?

  2. haridas_mandal
    • 3 years ago
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    The question i have posted verbatim from my daughter's weekly test. I am not sure but there must be some conditionalities for 20 m/s to be the minimum velocity ..

  3. JamesWolf
    • 3 years ago
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    and there is no diagram or anything?

  4. haridas_mandal
    • 3 years ago
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    No none. Only 4 options as I noted above.

  5. JamesWolf
    • 3 years ago
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    it doesnt even have the word "the" at the start of the sentence? Perhaps she copied the question down wrong?

  6. haridas_mandal
    • 3 years ago
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    My mistake it should read "The Minimum.. I have the question paper right in front of me..

  7. JamesWolf
    • 3 years ago
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    and it just gives "find the vel of projection"?

  8. haridas_mandal
    • 3 years ago
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    It reads " The Minimum.....with the horizontal. The velocity of projection is 1) 20 m/s 2) 10 m/s 3) 30 m/s 4) 40 m/s "

  9. JamesWolf
    • 3 years ago
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    RIGHTTT thats much better. so the minimum velocity is 20m/s in the horizontal direction. find the absolute velocity. okay so i think it looks like this

  10. JamesWolf
    • 3 years ago
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    |dw:1350148494782:dw| your trying to find the hypotenuse

  11. JamesWolf
    • 3 years ago
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    yes, that gives an answer which is one of your possible answers

  12. haridas_mandal
    • 3 years ago
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    Her text book says there is a minimum velocity of projection to reach a specific point .I am not very satisfied taking 20 m/s as the vel in the horizontal direction. It should have been 20 Cos 60 as the horizontal component as it remains constant..is there any other possibility?

  13. JamesWolf
    • 3 years ago
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    wel in this isntance ? = 40 m/s

  14. JamesWolf
    • 3 years ago
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    what is the specific point?

  15. haridas_mandal
    • 3 years ago
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    How did you deduce? Pl help as I need to understand & then teach my daughter.

  16. JamesWolf
    • 3 years ago
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    Well I just found the hypotenuse of that triangle \[velocity = hypotenuse = \frac{20 m /s}{\cos (60)} = 40 m/s\]

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