Which requires more work lifting a 10kg sack of coal or lifting a 15kg bag of feathers ?

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Grade: Education Subject: arabe
Which requires more work lifting a 10kg sack of coal or lifting a 15kg bag of feathers ?
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Réponse :

The one who requires more work lifting, is the 15 kg bag of feathers.

Explications :

This is a bit tricky. But for this exercice, you don't care about what's after 10kg and 15kg. It's all about numbers.

Hope it help, sorry for my bad english.