Calculate the work done when a student weighing 400N carries a weight of 200N from ground to a height of 15m.(Take g=10m/s²) (possible answer will be 9000J)
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students stand 2 metre apart in front of a plane mirror that is 3 m long . student Y is standing at the midpoint of the mirror. How many students can see the images of the other two? See attachment for more info(d) To neutralize the acidity in the wastewater
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