What is the energy equivalent of an object with a mass of 4.1 kg?

Use Einstein’s mass-energy equation, E = mc². With m = 4.1 kg and c ≈ 3.0 × 10⁸ m/s, E = 4.1 × (3.0 × 10⁸)² ≈ 3.7 × 10¹⁷ J, so the energy equivalent is 3.7 × 10¹⁷ J.

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