The correct answer is at 15 m. CONCEPT: Potential energy is defined as the energy stored due to change in position relative to others, stresses within itself, or many factors. The potential energy (U) = m g h . Here, mass is denoted with , length with , and time with . If the height of a body increases from the ground its energy increases and vice versa. The Dimension of energy is - ML2T-2 Explanation: Object 1: PE = mgh Height = 5 m, Mass = m. P.E1 = m × g × 5 = 5mg P.E1 = 5 mg Object 2: PE = mgh Height = 10 m, Mass = m. P.E1 = m × g × 10 = 10mg P.E1 = 10 mg Object 2: PE = mgh Height = 15 m, Mass = m. P.E1 = m × g × 15 = 15mg P.E1 = 15 mg Therefore, the highest potential energy has an object kept with a height of 15 m. PE = 15mg > 10mg > 5mg