The height of a missile above its launch point can be found using 𝑠 equals 𝑢𝑡 minus four point nine 𝑡 squared, where 𝑠 meters is the height above the launch point, 𝑢 meters per second is the vertical launch speed, and 𝑡 seconds is the time after launch. A missile is launched vertically upwards with a speed of 49 meters per second. At what times will it be 44.1 meters above its launch point?