Determine recoil velocity and loss in kinetic energy given mass and initial velocity. No specific example I just need an explanation as to how to approach a problem, like what formula to use and why.

are you like autistic or something?

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the entire statement is true and correct.  

there's no diagram, nothing is illustrated, and no question is asked.

0.11 m/s and 0.28 m/s should be correct

b. a lightning bug, plug of grass, and a worm