Question

1. what units are used to measure energy?
2. if kinetic energy is equal to 8.5j and potential energy is equal to 4.5 j what is its mechanical energy?

Explanation:

Step1: Recall the formula for mechanical energy

Mechanical energy ($E_{mech}$) is the sum of kinetic energy ($E_{k}$) and potential energy ($E_{p}$), so the formula is $E_{mech}=E_{k} + E_{p}$.

Step2: Substitute the given values

We know that $E_{k}=8.5\,\text{J}$ and $E_{p}=4.5\,\text{J}$. Substituting these values into the formula, we get $E_{mech}=8.5 + 4.5$.

Step3: Calculate the sum

$8.5+4.5 = 13$. So the mechanical energy is $13\,\text{J}$.

Answer:

The mechanical energy is $13\,\text{J}$.