A 2 kg mass is raised by 3 m. What is the change in gravitational potential energy delta U_grav? (g = 9.8 m/s^2)

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Multiple Choice

A 2 kg mass is raised by 3 m. What is the change in gravitational potential energy delta U_grav? (g = 9.8 m/s^2)

Explanation:
When you lift a mass in gravity, the gravitational potential energy increases by the work you do against gravity. This change is ΔU_grav = m g Δh. Plugging in m = 2 kg, g = 9.8 m/s^2, and Δh = 3 m gives ΔU_grav = 2 × 9.8 × 3 = 58.8 J. So the mass gains 58.8 joules of gravitational potential energy. If it were lowered by 3 m, the change would be −58.8 J.

When you lift a mass in gravity, the gravitational potential energy increases by the work you do against gravity. This change is ΔU_grav = m g Δh. Plugging in m = 2 kg, g = 9.8 m/s^2, and Δh = 3 m gives ΔU_grav = 2 × 9.8 × 3 = 58.8 J. So the mass gains 58.8 joules of gravitational potential energy. If it were lowered by 3 m, the change would be −58.8 J.

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