lea has just ordered a box of "universal" litmus paper. she dips one piece into vial a, and it turns green. she dips another piece into vial b, and it turns red.
which vial, a or b, contains a greater concentration of h+ ions?

Asailboat is traveling to the right when a gust of wind causes the boat to accelerate leftward at 2.5m/s2 for 4s. after the wind stops, the sailboat is traveling to the left with a velocity of 3.0m/s.assuming the acceleration from the wind is constant, what was the initial velocity of the sailboat before the gust of wind? answer using a coordinate system where rightward is positive.