Created by StemPy LabA box is pushed around a closed loop on a rough floor, back to where it started. Which statement is true?
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← Spring 1 is twice as stiff as spring 2 (k₁ = 2k₂). Each is stretched by the **same force**. What is the ratio U₁ : U₂ of the energies they store?A 900 kg car coasts from rest down a hill 15 m high with its engine off, and reaches the bottom at 14 m/s. Taking g = 9.8 m/s², how much work did air drag and friction do on it? →
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