Please select the best answer from the choices provided

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A1kg cart slams into a stationary 1kg cart at 2 m/s. the carts stick together and move forward at a speed of 1 m/sl. determine whether kinetic energy was conserved in the collision. use the law of conservation of energy to explain the collision

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is

If element x has 99 protons how many electrons does it have