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A lizard, at an initial distance of 21 ~cm behind an insect, moves from rest with an acceleration of 2 ~cm / s ^2 and pursues the insect which is crawling uniformly along a straight line at a speed of 20 ~cm / s . Then the lizard will catch the insect after

Options

  1. A20 ~s
  2. B1 ~s
  3. C21 ~s
  4. D24 ~s

Correct answer

C. 21 ~s

Step-by-step solution

aligned & 1 2 2 t^2=21+20 t & t=21 . aligned

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