A car is moving with speed of 150,km / h and after applying brake it will move 27,m before it stops.

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2.Motion in Straight Line

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A car is moving with speed of $150\,km / h$ and after applying the brake it will move $27\,m$ before it stops. If the same car is moving with a speed of one third the reported speed then it will stop after travelling $....m$ distance.

A$2$

B$1$

C$4$

D$3$

(JEE MAIN-2022)

Solution

Stopping distance $=\frac{ v ^{2}}{2 a }= d$
If speed is made $\frac{1}{3} rd$
$d^{\prime}=\frac{1}{9} d . \quad d^{\prime}=\frac{27}{9}=3 \text {. }$
Braking acceleration remains same

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Solution

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