Maths-
General
Easy

Question

A lizard, at an initial distance of 21cm behind an insect, moves from rest with an acceleration of 2 c m divided by s to the power of 2 end exponent and pursues the insect which is crawling uniformly along a straight line at a speed of 20 c m divided by s. Then the lizard will catch the insect after

  1. 21sec    
  2. 24 sec    
  3. 20 sec    
  4. 1 sec    

The correct answer is: 21sec


    0. t plus fraction numerator 1 over denominator 2 end fraction left parenthesis 2 right parenthesis t to the power of 2 end exponent equals 20 cross times t plus 21 Þ t to the power of 2 end exponent minus 20 t minus 21 equals 0
    \ t equals 21sec.

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