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4.2 friction — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics4.2 friction1 Mark
MCQ
Consider a car moving along a straight horizontal road with a speed of $72\, km/h$. If the coefficient of kinetic friction between the tyres and the road is $0.5,$ the shortest distance in which the car can be stopped is ........ $m$ .$[g = 10\,m{s^{ - 2}}]$
  • A
    $30$
  • ✓
    $40$
  • C
    $72$
  • D
    $20$
✓

Answer

Correct option: B.
$40$
b
(b)$s = \frac{{{u^2}}}{{2\mu \;g}} = \frac{{{{(20)}^2}}}{{2 \times 0.5 \times 10}} = 40\;m$

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