A 10 kg crate is pushed 5 m across a floor with coefficient of kinetic friction 0.3. Taking g = 9.8 m/s², how much energy is dissipated as heat by friction?
Correct answer B. 147 J
Explanation
Friction f = μmg = 0.3 × 10 × 9.8 = 29.4 N. Heat produced = f × d = 29.4 × 5 = 147 J.
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