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A 65-kg ice skater stands facing a wall with his arms bent and then pushes away...

A 65-kg ice skater stands facing a wall with his arms bent and then pushes away from the wall by straightening his arms. At the instant at which his fingers lose contact with the wall, his center of mass has moved 0.50

What is the average force exerted by the wall on him?

What is the work done by the wall on him?

What is the change in the kinetic energy of his center of mass?

Express you answers in apptopriate units

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