Why does the total amount of energy before and after any energy transformations remain the same?   answer :       because energy cannot be created or destroyed, the total input is equal to the total output. the total amount of energy remains the same even though it may change forms.

Sample Response: Because energy cannot be created or destroyed, the total input is equal to the total output. The total amount of energy remains the same even though it may change forms.

b mirrors submit a iisner? e. for which optical devices does d sometimes have a positive value? o a a and b o b. a and c o c. b and d 0 d. b and cb

the answer is b, have negligible mass