A ball is thrown into the air by a baby alien on a planet in the system of Alpha Centauri with a velocity of 50 ft/s. Its height in feet after t seconds is given by y=50t15t2\displaystyle {y}={50}{t}-{15}{t}^{{{2}}}.

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.