A rollercoaster car is moving 19.8 m/s on flat ground when it hits the brakes. It accelerates at -3.77 m/s over the next 45.8 m. How much time does it take

Aprotein molecule in an electrophoresis gel has a negative charge. the exact charge depends on the ph of the solution, but 30 excess electrons is typical. what is the magnitude of the electric force on a protein with this charge in a 1600n/c electric field? write in two significant numbers, and also in newton