A body is oscillating up and down at the end of a spring. Let's consider when the body is at the top of its up-and-down motion. The velocity
A) is zero.
B) has its largest magnitude.
C) points up.
D) points down.

Question

Quizplus · Accepted Answer

When a body is at the top of its up-and-down motion, its velocity is zero. This is because it has reached the highest point in its motion and is about to reverse direction and start moving downwards. Thus, option A is the correct choice. Option B is incorrect because the velocity at the highest point is zero, so it cannot have its largest magnitude. Options C and D are also incorrect because the direction of the velocity at the highest point depends on the direction of the motion leading up to that point, and could be either up or down.

A Body Is Oscillating Up and Down at the End