<h2>
a) Potential energy of ball relative to ceiling is 19.62 J</h2><h2>
b) Potential energy of ball relative to floor is 39.24 J</h2><h2>
c) Potential energy of ball relative to same elevation is 0 J</h2>
Explanation:
Mass of ball, m = 2 kg
Acceleration due to gravity, g = 9.81 m/s²
Height of ball from ground = 3 - 1 = 2 m
Potential energy, PE = mgh
Potential energy of ball, PE = 2 x 9.81 x 2 = 39.24 J
a) Potential energy of ball at ceiling = 2 x 9.81 x 3 = 58.86 J
Potential energy of ball relative to ceiling = 58.86 - 39.24 = 19.62 J
b) Potential energy of ball at floor = 2 x 9.81 x 0 = 0 J
Potential energy of ball relative to floor = 39.24 - 0 = 39.24 J
c) Potential energy of ball at same elevation = 2 x 9.81 x 2 = 39.24 J
Potential energy of ball relative to same elevation = 39.24 - 39.24 = 0 J
