Kinetic and Static Friction

AP Physics 1· difficulty 4/5

A 5 kg block sliding at 8 m/s on a horizontal surface comes to rest in 4 m. The coefficient of kinetic friction is approximately

A
$0.82$
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B
$1.0$
C
$0.10$
D
$0.50$

Explanation

\mu_k mg\cdot d = (1/2)mv^2 \Rightarrow \mu_k = v^2/(2gd) = 64/(2\cdot 9.8\cdot 4) \approx 0.816

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