Mary rode her bike 500 meters in 6 seconds what is the speed

Momentum              = (mass) x (speed)

                                              16 kg-m/s              =  (8 kg) x (speed)

Divide each side by (8 kg),

and you have                        (16 kg-m/s) / (8 kg) = Speed

                                                            2 m/s      = Speed

increased stability in the completion of fluorine's outer shell.