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JEE Main 20244 AprilEvening Shift

Exam: JEE Main
Year: 2024
Date: 4 April
Shift: Evening Shift
Subject: Physics
Chapter: Motion in One Dimension

JEE Main 2024 · 4 April · Evening Shift · Physics · Motion in One Dimension

A bus moving along a straight highway with speed of 72 ~km / h is...

A bus moving along a straight highway with speed of

72 \mathrm{~km} / \mathrm{h}

is brought to halt within

4 s

after applying the brakes. The distance travelled by the bus during this time (Assume the retardation is uniform) is _____m.

Correct answer

0

Step-by-step solution

\begin{aligned} & \text{ Initial velocity }=u=72 \mathrm{ km} / \mathrm{h}=20 \mathrm{ m} / \mathrm{s} \\ & \mathrm{v}=\mathrm{u}+\text{ at } \\ & \Rightarrow 0=20+\mathrm{a} \times 4 \\ & \mathrm{a}=-5 \mathrm{ m} / \mathrm{s}^2 \\ & \mathrm{v}^2-\mathrm{u}^2=2 \text{ as } \\ & \Rightarrow 0^2-20^2=2(-5) . \mathrm{s} \\ & \mathrm{s}=40 \mathrm{ m}\end{aligned}

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