A projectile is shot upward from the surface of Earth with an initial velocity of 137 meters per second. Use the position function below for free-falling objects. What is its velocity (in m/s ) after 2 seconds? After 12 seconds? (Round your answers to one decimal place.) s(t) = −4.9t2 + v0t + s0 2 s m/s 12 s m/s