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General
Easy

Question

A bullet is fired with a speed of 1000 blank m divided by s e c in order to hit a target 100 blank m away. If g equals 10 blank m divided by s to the power of 2 end exponent, the gun should be aimed

  1. Directly towards the target  
  2. 5 blank c m blank a b o v e blank t h e blank t a r g e t  
  3. 10 blank c m blank a b o v e blank t h e blank t a r g e t  
  4. 15 blank c m blank a b o v e blank t h e blank t a r g e t  

The correct answer is: 5 blank c m blank a b o v e blank t h e blank t a r g e t


    Bullet will take fraction numerator 100 over denominator 1000 end fraction equals 0.1 s e c to reach target.
    During this period vertical distance (downwar(d) travelled by the bullet equals fraction numerator 1 over denominator 2 end fraction g t to the power of 2 end exponent equals fraction numerator 1 over denominator 2 end fraction cross times 10 cross times open parentheses 0.1 close parentheses to the power of 2 end exponent m equals 5 c m
    So the gun should be aimed 5 blank c m above the target

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