First slide

Kinetic friction

Question

A body is projected along a rough horizontal surface with a velocity 6 m/s. If the body comes to rest after travelling a distance of 9 m, the coefficient of sliding friction is (g = 10 m/s²)

Easy

A

0.5
B

0.6
C

0.4
D

0.2

Solution

$\begin{array}{l} U^{2} = 2 as \\ U^{2} = 2 μgs \\ μ = \frac{U^{2}}{2 gs} = \frac{6 \times 6}{2 \times 10 \times 9} = 0.2 \end{array}$

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