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Physics · Oct / Nov 2018 · Paper 11 · Question 5

5054Balanced and unbalanced forces

An engine pulls a truck at constant speed on a level track. The link between the engine and the truck breaks. The driving force on the engine remains constant. What effect does this have on the engine and on the truck?

  1. Aengine: speed stays constant; truck: slows down
  2. Bengine: speeds up; truck: slows down
  3. Cengine: speed stays constant; truck: stops immediately
  4. Dengine: speeds up; truck: stops immediately

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Correct answer: B. engine: speeds up; truck: slows down

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