A wall is 12m long and 4m high.there is a rectangular window measuring 2.5m by 2m in the wall .find how much it will cost to paint the wall at the rate of 22per sq.m
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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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