Question

a cup is sitting on a table. it has 4 units of gravitational potential energy. what is the total energy? 6 units 2 units 4 units 5 units

Explanation:

Step1: Analyze the motion state

The cup 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 \(v = 0\), \(E_{k}=0\) units.

Step2: Calculate total energy

The total mechanical energy \(E_{total}=E_{p}+E_{k}\). Given \(E_{p} = 4\) units and \(E_{k}=0\) units, then \(E_{total}=4 + 0=4\) units.

Answer:

4 units