AP Physics 1hardmcq1 pt
A 8.0 kg block slides down a 30° incline where μ_k = 0.20 (sin 30° = 0.50, cos 30° = 0.87, g = 10 m/s²). Its acceleration is
A.3.3 m/s²
B.5.0 m/s²
C.1.7 m/s²
D.6.7 m/s²
Explanation
Core Concept
a = g(sinθ − μ_k cosθ) = 10(0.50 − 0.20·0.87) = 10(0.326) ≈ 3.3 m/s².
Correct Answer
A3.3 m/s²
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