Achild has a toy tied to the end of a string and whirls the toy at constant speed in a horizontal circular path of radius r. the toy completes each revolution of its motion in a time period t. what is the magnitude of the acceleration of the toy?

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 !