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A model-train car of mass 240 g traveling with a speed of 0.50 m/s links up...

A model-train car of mass 240 g traveling with a speed of 0.50 m/s links up with another car of mass 425 g that is initially at rest.

(a) What is the speed of the cars immediately after they have linked together?
m/s

(b) Find the initial kinetic energy.
mJ

(c) Find the final kinetic energy.
mJ

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