Heights and Distances JEE Main previous year questions with solutions

1 solved JEE Main questions on Heights and Distances, free to read — no sign-in needed. The full chapter has 45 questions; sign in to attempt the remaining 44 in the exam simulator.

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1. Q1JEE Main 2005
   A lizard, at an initial distance of $21 \mathrm{~cm}$ behind an insect, moves from rest with an acceleration of $2 \mathrm{~cm} / \mathrm{s}^2$ and pursues the insect which is crawling uniformly along a straight line at a speed of $20 \mathrm{~cm} / \mathrm{s}$. Then the lizard will catch the insect after
   1. A.$20 \mathrm{~s}$
   2. B.$1 \mathrm{~s}$
   3. C.$21 \mathrm{~s}$
   4. D.$24 \mathrm{~s}$
   Show answer & solution

   Answer: (C)

   $$\begin{aligned} & \frac{1}{2} 2 t^2=21+20 t \\ & \Rightarrow t=21 . \end{aligned}$$