Karl told his brother Charles, ” i just couldn’t lift the 30-kg bag of cement into dad’s wheelbarrow until i…

Karl told his brother Charles, ” i just couldn’t lift the 30-kg bag of cement into dad’s wheelbarrow until i got a pulley and a rope. then it was easy.” Charles was surprised “you got the cement into the wheelbarrow!? how did you do it? how much easier was it?” explain how you think karl lifted the cement and how much effort he had to apply.
 
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