The figure shows the speed as a function of time for an object in free fall near the surface of the earth. The object was dropped from rest in a long evacuated cylinder.
-What is the speed of the object 3.0 seconds after it is dropped?
A)3.0 m/s
B)7.7 m/s
C)9.8 m/s
D)29 m/s
E)This cannot be determined since there is no specified value of height.

Question

The figure shows the speed as a function of time for an object in free fall near the surface of the earth.  The object was dropped from rest in a long evacuated cylinder.
-What is the speed of the object 3.0 seconds after it is dropped?
A)3.0 m/s 
B)7.7 m/s 
C)9.8 m/s 
D)29 m/s 
E)This cannot be determined since there is no specified value of height.

Quizplus · Accepted Answer

The speed of an object in free fall is calculated using the formula v = g*t, where g is the acceleration due to gravity (approximately 9.8 m/s²) and t is the time in seconds. After 3 seconds, the speed is 9.8 m/s² * 3 s = 29.4 m/s, which rounds to 29 m/s.

The Figure Shows the Speed as a Function of Time