The distances(in m) above the ground for a projectile fired vertically upward with a velocity of 4 [ a] m / s as a function of time t =s) is given by s = 4 [ a] t 4. [ b] t^ 2.

a=2 b=7

find t for v = 0

find v for t = 4

find v for t = 5

what conclusion can be drawn?