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

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

The kinetic energy of the object is at a minimum at the extreme points A and B, where the velocity is zero. At any other point between A and B, the object will have some velocity and therefore some kinetic energy.

An Object Is Attached to a Vertical Ideal Massless Spring