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A toy railroad car having a mass of 4 kg initially moving with a speed of 3 m/s collides and locks to another toy railroad car which is initially at rest. The two cars move off together with a speed of 1 m/s after the collision. What is the mass of the toy car that was initially at rest? 48.A...

explorer. How do I stop it? HELP!! I'm sure this is a virus. It started when I would click on a google search result, but now it happens every time I open internet explorer. I'm still able to use Mozilla (for now), but if that gets infected I am afraid I will lose internet access altogether...