Hi, Im having a problem solving one part of a question.. 1) A ball is thrown upward with the initial velocity of 80 m/s. a- How long is the ball in the air? 16.33s b- What is the greatest height reached by the ball? 326.26m c- when is the ball 20m above the ground? I think im doing this wrong, but I put 20 = v_0*t, 20/V_0 = t and i get 0.25s d- what is the velocity of the ball, when it hits the ground? On this one Im totaly lost, but I managed to get sqrt(2g+v^2+h) which I know is wrong. I think a and b are correct but Im not so sure about the c and d, If you can read over it and see if it right I would appreciate it.. Thank You.