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.
-Which one of the following statements best explains why the graph goes through the origin?
A)The object was in a vacuum.
B)The object was dropped from rest.
C)The velocity of the object was constant.
D)All v vs. t curves pass through the origin.
E)The acceleration of the object was constant.

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.
-Which one of the following statements best explains why the graph goes through the origin?
A)The object was in a vacuum. 
B)The object was dropped from rest. 
C)The velocity of the object was constant. 
D)All v vs. t curves pass through the origin. 
E)The acceleration of the object was constant.

Quizplus · Accepted Answer

When an object is dropped from rest, its initial velocity is zero. Therefore, the velocity-time graph starts at the origin.

The Figure Shows the Speed as a Function of Time