Physics-
General
Easy

Question

A ball is thrown vertically upwards with a velocity of 25 blank m s to the power of negative 1 end exponent from the top of a tower of height 30 blank m. How long will it travel before it hits ground

  1. 6 s  
  2. 5 s  
  3. 4 s  
  4. 12 s  

The correct answer is: 6 s


    S equals u t plus fraction numerator 1 over denominator 2 end fraction g t to the power of 2 end exponent
    30 equals negative 25 t plus fraction numerator 10 over denominator 2 end fraction t to the power of 2 end exponent or t to the power of 2 end exponent minus 5 t minus 6 equals 0
    Or open parentheses t minus 6 close parentheses open parentheses t plus 1 close parentheses equals 0 Take positive root
    therefore t equals 6 blank s e c

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