Kinetic and Static Friction

AP Physics 1· difficulty 4/5

\theta = 30°

A
$1.96 m/s²$
B
$3.20 m/s²$
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C
$4.90 m/s²$
D
$2.55 m/s²$

Explanation

a = g(\sin\theta - \mu_k \cos\theta) = 9.8(0.5 - 0.20 \times 0.866) \approx 9.8(0.5 - 0.1732) \approx 9.8(0.3268) \approx 3.20\text{ m/s}^2

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