please assist

A ball is throwntgnto the air with an initial velocity of 64 ftfs. Its height in feet after t seconds is given by y = 6-11! 16 . (a! Find the average velocity for the time period beginning at 2 seconds and lasting for the following number of seconds (round your answers to four decimals as needed}: .01 set: U .005 sec: .002 sec: .001 sec: (h) Estimate the instanteneeus velocity when t = 2. I:] M