AP Physics 1mediummcq1 pt
A child on a swing rises to 1.8 m above the lowest point and has speed 2.0 m/s there (g = 10 m/s²). The speed at the lowest point is about
A.6.3 m/s
B.4.0 m/s
C.9.0 m/s
D.3.2 m/s
Explanation
Core Concept
½mvb² = ½mv² + mgh: vb = √(4 + 2·10·1.8) = √40 ≈ 6.3 m/s.
Correct Answer
A6.3 m/s
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