# A body starts from rest on a long inclined plane of slope $45^{\circ}$. The coefficient of friction between the body and the plane varies as $\mu=0.3 x$, where $x$ is distance travelled down the plane. The body will have maximum speed (for $g=10 \mathrm{~m} / \mathrm{s}^{2}$ ) when $x=\quad$

Question:

A body starts from rest on a long inclined plane of slope $45^{\circ}$. The coefficient of friction between the body and the plane varies as $\mu=0.3 x$, where $x$ is distance travelled down the plane. The body will have maximum speed (for $g=10 \mathrm{~m} / \mathrm{s}^{2}$ ) when $x=\quad$

1. $9.8 \mathrm{~m}$

2. $27 \mathrm{~m}$

3. $12 \mathrm{~m}$

4. $3.33 \mathrm{~m}$

JEE Main Previous Year Single Correct Question of JEE Main from Physics Laws of Motion chapter.

JEE Main Previous Year April 22, 2013

Correct Option: 4

Solution:

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