physics
posted by ashley  HELP PLEASEE!!! .
A 15.0kilogram 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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Sra 
work done = change in kinetic energy
= (1/2) (15)(11.5^2  7.5^2) 
1140

570J is the correct answer
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