Which equation represents the law of conservation of energy in a closed system?

o ke + pe = ke: + pe

pe; + pex = ke + ke

ke - ke = pe - pe

o ke - pe; = pe; - ke

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KE + PE = KE + PE

Explanation:

In a closed system, the mechanical energy of the system is constant.

Mechanical energy is given by the sum of kinetic energy and potential energy; mathematically:

U = KE + PE

where

KE is the kinetic energy

PE is the potential energy

This means that if we consider two situations, one at the beginning and one at the end, the value of U will not change if the system is closed; this means that the sum KE + PE will remain the same, so we can write:

KE + PE = KE + PE

0.19 m/s and 0.45 m/s