The distance s (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 ( in s) is given by s = 4 [ a] t − 4. [ b] t^ 2. a=0 and b=9.Find the answers
find t for v = 0
find v for t = 4
find v for t = 5