1. The problem statement, all variables and given/known data A ball is thrown straight up with an initial speed of 30m/s, (a) Show that the time it takes to reach the top of its trajectory will be 3 seconds. (b) Show that it will reach a height of 45m (neglecting air resistance). 2. Relevant equations Earth's gravity = 9.8 meter/second² (Professor said to just round it to 10). Equation unknown. d=1/2(g)t² ? 3. The attempt at a solution (a) Played around with Subtracting negative -9.8m/s² (is it considered negative since the ball gets thrown up? - Instead of it coming down?). (b) 45m = 1/2(9.8m/s²)t² - I figure I need to know "t" before I could solve this.