A ball is thrown into the air by a baby alien on a planet in the system of Alpha Centauri with a velocity of 42 ft/s. Its height in feet after t seconds is given by y = 42t - 18t. A. Find the average velocity for the time period beginning when t=1 and lasting 01 s: 005 S: 002 s: 001 s: NOTE: For the above answers, you may have to enter 6 or 7 significant digits if you are using a calculator. Estimate the instanteneous velocity when t=1