AP Physics 1hardmcq1 pt
A 0.30 kg mass oscillates on a spring with amplitude 0.20 m. At displacement 0.10 m, its speed is 3.0 m/s. The spring constant is about
A.68 N/m
B.90 N/m
C.45 N/m
D.135 N/m
Explanation
Core Concept
Energy conservation: ½kA² = ½mv² + ½kx². Substituting gives 0.02k = 1.35 + 0.005k, so 0.015k = 1.35 and k = 90 N/m.
Correct Answer
B90 N/m
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