The ball is thrown upward with the initial velocity of 25 meters/second from the cliff that's 200 meters high. Height of ball is provided by quadratic equation:
h = 4.9t^2 + 25t + 200, where h is in meters and t is time in seconds as ball was thrown. Determine time when ball will be 20 meters from ground.
i) 9.1 seconds
ii) 2.6 seconds
iii) 4.025 seconds
iv) 10.4 seconds