What is this?
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Work = force × a. work b. energy c. distance d. momentum

This is the substance(s) formed in a chemical reaction.

If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.