A boy sees a flower pot sail up and then back past a window 2.8 m high. If the total time the pot is in sight is 1.1 s, find the height above the top of the window that the pot rises. (Your answer must be in units of cm's and include 1 digit after the decimal point. Maximum of 4% of error is accepted in your answer. Take g-9.80 m/s ?.)