Energy in SHM: An object is attached to a vertical ideal massless spring and bobs up and down between the two extreme points A and B. When the kinetic energy of the object is a minimum, the object is located
A) at either A or B.
B) midway between A and B.
C) 1/3 of the distance from A to B.
D) 1/4 of the distance from A to B.
E) 1/ times the distance from A to B.

Question

Energy in SHM: An object is attached to a vertical ideal massless spring and bobs up and down between the two extreme points A and B. When the kinetic energy of the object is a minimum, the object is located
A) at either A or B. 
B) midway between A and B. 
C) 1/3 of the distance from A to B. 
D) 1/4 of the distance from A to B. 
E) 1/ times the distance from A to B.

Quizplus · Accepted Answer

At the extreme points A and B, the kinetic energy is zero and the potential energy is maximum. At the equilibrium point, the potential energy is minimum and the kinetic energy is maximum. Therefore, at the point where the kinetic energy is a minimum, the object must be at either point A or B.

Energy in SHM: an Object Is Attached to a Vertical