AP Physics 1mediummcq1 pt
A car brakes from 30 m/s to rest over 90 m with constant acceleration. The magnitude of its acceleration is
A.5.0 m/s²
B.10 m/s²
C.2.5 m/s²
D.1.7 m/s²
Explanation
Core Concept
v² = v₀² + 2aΔx gives a = −v₀²/(2Δx) = −900/180 = −5.0 m/s²; magnitude 5.0 m/s².
Correct Answer
A5.0 m/s²
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