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13. Is it possible to work in pushing an object without transferring any energy to the object? Describe the situation with the work done in this case and what happens to the energy. [2 marks] 14. A baseball and a shot used in shot put have the same kinetic energy. Which hast the greater momentum? Why? [2 marks] 15. Give an example of a collision in which the momentum of the system of the colliding objects is not conserved. Explain why momentum is not conserved in this situation but is conserved in other situations. [2 marks]