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QJEEM23Ph1720: JEE Main 2023 Physics - Class 11 JEEM23Ph1720 Solution: A body of mass is moving with an initial speed of . The body…

A body of mass 10 kg10 \mathrm{~kg} is moving with an initial speed of 20 m/s20 \mathrm{~m} / \mathrm{s} . The body stops after 5 s5 \mathrm{~s} due to friction between body and the floor. The value of the coefficient of friction is:

(Take acceleration due to gravity g=10 ms−2g=10 \mathrm{~ms}^{-2} )

Multiple Choice Options

  • A 0.3
  • B 0.2
  • C 0.5
  • D 0.4

Step-by-Step Verified Solution

a=−μga=-\mu g

amp;∵v=u+atamp;0=20+(−μ×10)×5amp;50μ=20amp;μ=25=0.4\begin{aligned}& \because v=u+a t \\\\& 0=20+(-\mu \times 10) \times 5 \\\\& 50 \mu=20 \\\\& \mu=\frac{2}{5}=0.4\end{aligned}

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