if a ball is thrown into the air with a velocity of 45 ft/s, its height (in feet) after t seconds is given by y = 45t - 16t2. find the velocity when t = 2.

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So since the snail is moving at 3.6  miles per hour you multiply by 5280 to change it into feet per hour. so you get 36*528 ft per hour. since there are 3600 seconds in an hour, you divide 36*528 by 3600. so simplifying we get 528/100 which is 5.28 ft per second