A body is projected vertically upwards from ground level with an initial velocity of 400m/s. determine;
(a) Time to reach the ground
(b) Velocity at a point 1.8km above the ground
(c) Time to reach a vertical height of 2.5km.
total time to reach ground 40.77*2=81.54
s=1908 + (-8153.05)
s=-6245.05 m = 6.24km