Question

the object at point a has a potential energy of 140 j and a kinetic energy of 420 j. what is the total energy?
height (m) vs. time (s)
options: 420 j, 560 j, 280 j

Explanation:

Step1: Recall total energy formula

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

Step2: Substitute given values

Given $E_{p}=140\ \text{J}$ and $E_{k}=420\ \text{J}$, then $E_{total}=140 + 420$.

Step3: Calculate the sum

$140+420 = 560\ \text{J}$.

Answer:

560 J