Question
A person throws a ball up into the sir, and the ball falls back toward Earth. At which point would the kinetic energy be the lowest?
A. When the ball leaves the person’s hand
B. At a point when the ball is still rising
C. At a point before the ball hits the ground
D. When the ball is at its highest point
A. When the ball leaves the person’s hand
B. At a point when the ball is still rising
C. At a point before the ball hits the ground
D. When the ball is at its highest point
Answers
GPT-4o mini
The kinetic energy of the ball is lowest at the point when the ball is at its highest point (D). At this point, the ball has momentarily stopped before starting to fall back down, meaning its velocity is zero. Since kinetic energy is calculated using the formula \( KE = \frac{1}{2}mv^2 \), where \( m \) is mass and \( v \) is velocity, the kinetic energy is zero when the velocity is zero, making it the lowest at the highest point.
So, the correct answer is: **D. When the ball is at its highest point.**
So, the correct answer is: **D. When the ball is at its highest point.**