You throw a ball upward with an initial speed of 4.3 m/s. when it returns to your hand 0.88 s later, it has the same speed in the downward direction (assuming air resistance can be ignored). what was the average acceleration vector of the ball? express your answer using two significant figures.

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !