12. If the roller coaster car in the above problem were moving with twice the speed, then what would be its new kinetic energy?

Aproton is projected toward a fixed nucleus of charge +ze with velocity vo. initially the two particles are very far apart. when the proton is a distance r from the nucleus its velocity has decreased to 1/2vo. how far from the nucleus will the proton be when its velocity has dropped to 1/4vo?

Write the correct abbreviation for each metric unit

Which best describes the difference between internal and thermal energy?