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Question

A body projected vertically upwards with velocity u returns to the starting point in 4 blankseconds. If g equals 10 blank m divided by s e c to the power of 2 end exponent, the value of u is

  1. 5 blank m divided by s e c  
  2. 10 blank m divided by s e c  
  3. 15 blank m divided by s e c  
  4. 20 blank m divided by s e c  

The correct answer is: 20 blank m divided by s e c


    Time of flight T equals fraction numerator 2 u over denominator g end fraction 4 sec invisible function application rightwards double arrow u equals 20 blank m divided by s

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