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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
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Verified Answer
The correct answer is:
$21 \mathrm{~s}$
$21 \mathrm{~s}$
$$
\begin{aligned}
& \frac{1}{2} 2 t^2=21+20 t \\
& \Rightarrow t=21 .
\end{aligned}
$$
\begin{aligned}
& \frac{1}{2} 2 t^2=21+20 t \\
& \Rightarrow t=21 .
\end{aligned}
$$
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