posted by ashley --- HELP PLEASEE!!! .
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?
Here are some Physics Tutorials to keep handy:
work done = change in kinetic energy
= (1/2) (15)(11.5^2 - 7.5^2)
570J is the correct answer