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Physics · MOTION IN A STRAIGHT LINE
हिन्दीA car of a particular make travelling at \( 15\text{ m/s} \) requires a braking distance of \( 20\text{ m} \) to come to rest. Assuming the same maximum braking capacity (deceleration), what will be its braking distance when travelling at \( 30\text{ m/s} \)?
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Correct answer · Option B
\( 80\text{ m} \)
Explanation
Braking distance \( d \propto v^2 \). Since velocity is doubled from \( 15\text{ m/s} \) to \( 30\text{ m/s} \), distance increases by a factor of \( 2^2 = 4 \). New braking distance = \( 20 \times 4 = 80\text{ m} \).
