2. A 5 year old child pushes with a force of 5 N to get a sumo wrestler to move, but the wrestler does not budge. What is the work done by the child on the sumo wrestler? (5)
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Why don't you see your reflection in water with waves or repples

Astudent creates a model of a closed ecosystem by filling a glass tank half full with water, then adding 10 snails and two small aquatic plants. the next day, all the snails are dead. what is the most likely cause of their death?

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