Question

an unstretched rubber band is sitting on a table and has 5 units of gravitational potential energy. what is the total energy? 6 units 8 units 3 units 5 units

Explanation:

Step1: Analyze the motion state

The rubber band is sitting on the table, so its velocity \(v = 0\). According to the formula of kinetic energy \(E_{k}=\frac{1}{2}mv^{2}\), when \(v = 0\), \(E_{k}=0\).

Step2: Calculate total energy

The total energy \(E_{total}\) is the sum of potential energy \(E_{p}\) and kinetic energy \(E_{k}\). Given \(E_{p} = 5\) units and \(E_{k}=0\) units, so \(E_{total}=E_{p}+E_{k}=5 + 0=5\) units.

Answer:

5 units