qqp question1: A stone is thrown vertically upward with a velocity of 19.6 m/s. After 2 seconds, another stone is thrown upwards with a velocity of 9.8 m/s. When and where will these stones collide? Please answer the question with a step-by-step solution. question2: A stone is thrown vertically upward with a initial speed of 19.5m/s. What is the maximum height which it covers?