How many places are there for electrons in the second shell of an atom?

Which situation will produce the greatest change of momentum

Ablue car pulls away from a red stop-light just after it has turned green with a constant acceleration of 0.5 m/s 2 . a green car arrives at the position of the stop-light 6.5 s after the light had turned green. if t = 0 when the light turns green, at what time does the green car catch the blue car if the green car maintains the slowest constant speed necessary to catch up to the blue car? answer in units of s.

A10n falling encounters 10n of air resistance (upward force). the net force on the object is: