Recent content by CreekDog

Thanks guys, I see now that I need to be thinking about the total energy before and after, and remembering that the total momentum is zero. Time to go review!

Ah, okay. Is this effect permanent, so long as the clay is stationary? Could you keep doing this to the lumps of clay, and keep making them more and more massive, even when they're at rest after the collision? I guess in the real world, they'd lose a lot of their kinetic energy to heat during...

Hi Guys, I'm looking through one of the practice GRE tests, and I think that they have answered their own question incorrectly. I thought I'd get another opinion. Here it is: 36. A lump of clay whose rest mass is 4 kilograms is traveling at three-fifths the speed of light when it collides...