A softball of mass 200g is moving at 3m/s before it collides head-on with a baseball of mass 150g. After the collision, the baseball is moving forward at a speed of 2.5m/s. What is the velocity of the softball after the collision? p. s. plz add explanation

The air in an automobile tire with a volume of 2.60 ft3 is at 70°f and 21 psig. determine the amount of air that must be added to raise the pressure to the recommended value of 30 psig. assume the atmospheric pressure to be 14.6 psia and the temperature and the volume to remain constant. the gas constant of air is ru = 53.34ft⋅lbflbm⋅r(1 psia144 lbf/ft2) = 0.3704 psia⋅ft3lbm⋅r the amount of air that must be added to raise the pressure is lbm