Question 2 of 10 Which equation is an example of a redox reaction?
O A BaCl2 + Na S04 - 2NaCl +BaSO4
O B. Ca(OH)2 + H 503 - 2H0+ Casos
O C. 2K+ Cabry -2KBr + Ca
D. HCI+KOH -- KCI+H2O
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answer: the potential energy decreases from 379 j to 243 j

explanation:

for the law of conservation of energy, the total energy in a system must be conserved. the total energy of the system is given by the sum of kinetic (k) and potential (u) energy:

e = k + u

the total energy is e=675 j, and this does not change.

initially, the kinetic energy is k=296 j, so the potential energy is

at the end, the kinetic energy is k=432 j, so the potential energy is

so, we see that the potential energy has decreased from 379 j to 243 j.