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JEE Main 2004

Exam: JEE Main
Year: 2004
Subject: Physics
Chapter: Motion in One Dimension

JEE Main 2004 · Physics · Motion in One Dimension

An automobile travelling with speed of 60 ~km / h , can brake to...

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

Options

A $20 \mathrm{~m}$
B $40 \mathrm{~m}$
C $60 \mathrm{~m}$
D $80 \mathrm{~m}$

Correct answer

D. $80 \mathrm{~m}$

Step-by-step solution

If the initial speed is doubled, the stopping distance becomes four times, i.e.

80 \mathrm{~m}

.

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