The height in meters of a projectile shot vertically upward from a point 2m above ground level with an initial velocity of 24.5m/s is h=2+24.5t-4.9t^2 after t seconds.
a) Find the velocity after 2s and 4s
b) when does the projectile reach its max height?
c) What is the man height?
d) When does it hit the ground?
e) With what velocity does it hit the ground?