SAMPLE PROBLEM ON P.E. . • A grade 8 student carried his Biology project with a mass of 3kg from the ground floor to the third floor of the school building. The vertical distance from the ground floor to the third floor is 10 m. Compute the gravitational potential energy of the project with respect to the ground. STEP 1: Write the given with their respective units. STEP 2: Write the general formula. STEP 3: Substitute the given and execute the mathematical operation.​