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An automobile travelling with speed of $60 \mathrm{~km} / \mathrm{h}$, can brake to stop within a distance of $20 \mathrm{~cm}$. If the car is going twice as fast, i.e $120 \mathrm{~km} / \mathrm{h}$, the stopping distance will be
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$80 \mathrm{~m}$
$80 \mathrm{~m}$
If the initial speed is doubled, the stopping distance becomes four times, i.e. $80 \mathrm{~m}$.
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