Robert father is four time old as Robert after 5 years the father will become three times as old as Robert what will be the age of Robert and his father after 5 year in the term of variable x?
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Answer:Friction produces unnecessary heat leading to the wastage of energy. The force of friction acts in the opposite direction of motion, so friction slows down the motion of moving objects. Forest fires are caused due to the friction between tree branches.
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