A ball is thrown into the air with an initial velocity of 48 ft/s. Its height in feet after t seconds is given by y = 48t – 16t². (a) Find the average velocity for the time period beginning at 1 seconds and lasting for the following number of seconds (round your answers to four decimals as needed): .01 sec: 005 sec: .002 sec: .001 sec: (b) Estimate the instanteneous velocity when t = 1.

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