physics
posted by nour .
a person throws a ball upward into the air with an initial velocity of 15 m/s calculate
a)how high it goes?
b)how long the ball is in the air before it comes back ?
c)how much time it takes for the ball to reach the maximum height?

h = 15t  4.9t^2 = 4.9t(3.06t)
(c) max height is reached at t = 15/9.8
(b) h=0 when t=0 or 3.06
(a) calculate h using (a)