A toy helicopter takes off and moves 2 m up and then 2 m back down. What is the displacement of the helicopter?
A. 0 m
B. 2 m down
C. 2 m up
D. 4 m

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In an exothermic reaction the bonding energy of the product is: less than the reactants same as the reactants greater than the reactants dependent upon the presence of a catalyst

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