Question

When a ball is thrown vertically upward, the gravitational potential energy of the ball will:
a) decrease
b) increase
c) remain the same
d) be zero

Answer 1

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As we throw ball upwards, POTENTIAL ENERGY INCREASES, because from potential energy, we have

PE= m×g×h, which shows that potential energy is directly proportional to height, hence as height increases, potential energy increases.

Answer 2

When a ball is thrown vertically upward, the gravitational potential energy of the ball will increase.

Concept:

• Energy is defined as the capacity to do work.
• According to the conservation of energy, the total energy of the system always remains constant.
• Potential energy is the energy of a body due to its position.
• The total energy is the sum of kinetic energy plus potential energy.

Solution:

• In a case where a ball is thrown upward the kinetic energy of the ball is converted to potential energy.
• According to the conservation of energy sum of kinetic and potential energy is constant therefore the potential energy increases.
• In the beginning, the ball has only kinetic energy and no potential energy and as it moves upward its kinetic energy is converted to potential energy.

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