1. An object dropped from the top of a tall building falls y=4.9t^2 meters in the first t seconds.

What is the object's average speed during the first 4 seconds?

A. 4.9 m/s

B. 9.8 m/s

C. 19.6 m/s

D. 39.2 m/s

E. 78.4 m/s

2. An object dropped from the top of a tall building fallsy=4.9t2meters in the firsttseconds.

What is the object's instantaneous speed att= 4 seconds?

A. 4.9 m/s

B. 9.8 m/s

C. 19.6 m/s

D. 39.2 m/s

E. 78.4 m

3. Consider 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?

A. 7.2 ft./s

B. 8.1 ft./s

C. 10.8 ft./s

D. 12.2 ft./s

E. 13.5 ft./s

4. Consider 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?

A. 4.5 m/s

B. 5.4 m/s

C. 9.0 m/s

D. 10.8 m/s

E. 12.6 m/s