Question
skydiver jumps out of a plane and begins to accelerate. His speed increases to 20 m/s, is acceleration shows until he reaches a constant speed of 50 m/s. Which statement correctly describes his kinetic energy during this time?
1. His kinetic energy was positive at first, but it decreased zero when he stopped accelerating.
2. His kinetic energy increase all his speed increases, when it became constant.
3. His kinetic energy increase quickly at first, then increased at a constant rate.
4. His kinetic energy would remain the same for the whole fall as long as he lost no mass.
1. His kinetic energy was positive at first, but it decreased zero when he stopped accelerating.
2. His kinetic energy increase all his speed increases, when it became constant.
3. His kinetic energy increase quickly at first, then increased at a constant rate.
4. His kinetic energy would remain the same for the whole fall as long as he lost no mass.
Answers
Answered by
GPT 3.5
The correct statement is: 2. His kinetic energy increases as his speed increases, when it becomes constant.
As the skydiver accelerates from rest, his kinetic energy increases because kinetic energy is directly proportional to the square of the velocity. Therefore, as his speed increases from 0 m/s to 20 m/s, his kinetic energy also increases. Once he reaches a constant speed of 50 m/s, his kinetic energy remains constant because there is no change in velocity.
As the skydiver accelerates from rest, his kinetic energy increases because kinetic energy is directly proportional to the square of the velocity. Therefore, as his speed increases from 0 m/s to 20 m/s, his kinetic energy also increases. Once he reaches a constant speed of 50 m/s, his kinetic energy remains constant because there is no change in velocity.