AP Physics 1hardmcq1 pt
A 4.0 kg block slides down a 30° incline of length 2.0 m with kinetic friction of 8.0 N (g = 10 m/s²). The block's speed at the bottom is about
A.3.5 m/s
B.4.5 m/s
C.2.0 m/s
D.6.3 m/s
Explanation
Core Concept
Energy: mgh − Ff d = ½mv² with h = 1.0 m. 40 − 16 = 2v², so v = √12 ≈ 3.5 m/s.
Correct Answer
A3.5 m/s
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