Question

a bird has a kinetic energy of 3 j and a potential energy of 25 j. what is the mechanical energy of the bird? 3 j, because mechanical energy is the same as kinetic energy 22 j, because mechanical energy is the difference of the potential energy and kinetic energy 25 j, because mechanical energy is the same as potential energy 28 j, because mechanical energy is the sum of the potential energy and kinetic energy

Explanation:

Step1: Recall mechanical energy formula

Mechanical energy $E = K + U$, where $K$ is kinetic energy and $U$ is potential energy.

Step2: Identify given values

$K = 3\ J$, $U = 25\ J$.

Step3: Calculate mechanical energy

$E=3\ J + 25\ J=28\ J$.

Answer:

D. 28 J, because mechanical energy is the sum of the potential energy and kinetic energy