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 bys = 4 [a] t - 4.912 . Your instructor will provide you with a. Simply replace the letter with the corresponding digit. Do not multiply. For example, if [a] = 1, then 4 [a] is 41. Find the answers to these questions. . find t for v = 0 . find v fort = 4 . find v fort = 5 . What conclusions can you draw