An object dropped from the top of a tall building falls y = 4. 9t meters in the first t seconds. What is the object's average speed during the first 4 seconds? O A. 4.9 m/s O B. 9.8 m/s O C. 19.6 m/s O D. 39.2 m/s O E. 78.4 m/sAn object dropped from the top of a tall building falls y = 4. 9t meters in the first t seconds. What is the object's instantaneous speed at t = 4 seconds? O A. 4.9 m/s O B. 9.8 m/s O C. 19.6 m/s O D. 39.2 m/s O E. 78.4 m/sConsider an object dropped on the moon. In the following table, the distances the object falls during the first 3 seconds are shown. t (s) 0 1 2 3 y (ft.) 0 2.7 10.8 24.3 What is the object's average speed during the time interval from 1 s to 3 s? O A. 7.2 ft./s O B. 8.1 ft./s O C. 10.8 ft./s O D. 12.2 ft./s Go to the Next Question O E. 13.5 ft./sConsider an object dropped on Mercury. In the following table, the distances the object falls during the first 4 seconds are shown. t (s) 0 1 2 3 4 y (m) 0 1.8 7.2 16.2 28.8 Which of the following best represents an estimate of the object's instantaneous speed at t = 3 seconds? O A. 4.5 m/s O B. 5.4 m/s O C. 9.0 m/s O D. 10.8 m/s O E. 12.6 m/s