A ball is dropped from the top of the empire state building. The height, y, of the ball about the ground(in feet) is give as a function of time, t, (in seconds) by y=1250-16t^2 a.) find the velocity of the ball at time t. what is the sign of the velocity? why is this to be expected? b.)When does the ball hit the ground and how fast is it going at that time?give your answer in feet per second and in miles per hour (1ft/sec = 15/22mph

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