Posted by Anonymous on Thursday, October 20, 2011 at 6:12pm.
A ball is thrown straight up with an intial velocity of 85 ft/s. At what times will it have a height of 200 ft?

physics  bobpursley, Thursday, October 20, 2011 at 6:23pm
h=vi*t1/2 g t^2
200=85*t1/2 *33*t62 solve for time(s) t. use the quadratic formula. 
physics  drwls, Thursday, October 20, 2011 at 6:25pm
When 85 t  (g/2) t^2 = 200
g = 32.2 ft/s^2
Do the math. There will be two answers.