You are watching a semi truck bounce up and down on a spring. (Yep it's a toy!) At the topmost point in the truck's path,
A) the truck's velocity is downward but its acceleration is upward.
B) the truck's velocity is zero but its acceleration is upward.
C) the truck's velocity is upward but its acceleration is downward.
D) the truck's velocity is zero but its acceleration is downward.

Question

Quizplus · Accepted Answer

At the topmost point, the truck momentarily stops moving upward before it starts to move downward, so its velocity is zero. However, gravity is pulling it downward, so its acceleration is downward.

You Are Watching a Semi Truck Bounce Up and Down