If a ball is thrown straight up into the air with an initial velocity of 64 ft/sec, it's height in feet after t seconds is given by y=65t-16t^2. Find the average velocity for the time period beginning at t = 1 and lasting for .5, .1, and .01.
I've done this about 10 times and consistently get -40 for the first which lasts .5 seconds which I'm told is incorrect. Help!

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