physics

A 15.0-kilogram mass is moving at 7.50 meters per second on a horizontal, frictionless surface. What is the
total work that must be done on the mass to increase its speed to 11.5 meters per second?

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  1. work done = change in kinetic energy

    = (1/2) (15)(11.5^2 - 7.5^2)

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  2. 1140

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  3. 570J is the correct answer

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