Acar with a mass of 1.2 × 103 kilograms is moving at a speed of 18 meters/second. it is hit by a truck from behind and its speed after the collision increases to 20 meters/second. what is the value of impulse?

Me i dont know what to do! the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.