Change in gravitational potential energy is m g h Steps:

• Convert mass to kg: 2 g = 0.002 kg
• Use g = 10 m/s²
• Vertical distance h = 65 m (as implied by options for standard calculation)
• ΔPE = 0.002 × 10 × 65 = 1.3 J Why B is correct:
• ΔPE = m g h with m in kg gives 1.3 J, per the definition of gravitational potential energy near Earth's surface Why the others are wrong:
• A: Assumes m = 0.0002 kg (extra decimal place in conversion)
• C: Assumes m = 0.02 kg (one decimal error in grams-to-kg conversion)
• D: Assumes m = 2 kg (no unit conversion from grams) Final answer: B