PLEASE HELP A 0.25 kg ball strikes a 1.25 kg ball at rest. after collision the 0.25 kg ball is moving with a velocity of 18 m/s, and the second ball is moving with a velocity if 9m/s .what is the initial velocity of the first ball?

As seen in a us weather map, the h (or high) and l (or low) symbols indicate regions where surface air pressures are high or low, respectively, compared to surrounding areas. an h is plotted where the air pressure is highest and an l is plotted where the air pressure is lowest. proceeding outward and away from the center of a high pressure system, the air pressure "