Sky diver jumped out of a plane in beginning to accelerate his speed increases to 20 M/S then 30 a.m./S his acceleration shows until he reaches a consistent speed of 50 M/S which statement correctly describes his clinic energy during this time
His kinetic energy increases quickly at first and it increases at a constant rate
His klinic energy increases while his speed increases then it became constant
His kinetic energy was positive at first, but it decreased to zero then he stopped accelerating
His kinetic energy would remain the same for the whole fall as long as he lost no Mass
What is the correct answer?
The correct answer is: His kinetic energy increases while his speed increases, then it becomes constant.
The correct answer is: His kinetic energy increases while his speed increases, then it becomes constant.
To determine the correct answer, let's first understand the concept of kinetic energy. Kinetic energy is the energy possessed by an object due to its motion and can be calculated using the formula: KE = 1/2 * mass * velocity^2.
In this scenario, the skydiver jumps out of a plane and accelerates to different speeds. Let's analyze the given options:
1. "His kinetic energy increases quickly at first and it increases at a constant rate."
This statement implies that the kinetic energy increases both quickly and at a constant rate. However, this is not accurate because the skydiver's speed initially increases from 20 m/s to 30 m/s, and then to a consistent speed of 50 m/s. Therefore, the acceleration is not constant, and the kinetic energy increase is not at a constant rate.
2. "His kinetic energy increases while his speed increases, then it became constant."
This statement correctly describes the situation. As the skydiver accelerates his speed, his kinetic energy increases because kinetic energy is directly proportional to velocity squared. Once the skydiver reaches a consistent speed of 50 m/s, his kinetic energy remains constant because his velocity no longer changes.
3. "His kinetic energy was positive at first, but it decreased to zero then he stopped accelerating."
This statement is incorrect because kinetic energy does not need to decrease to zero for the skydiver to stop accelerating. The skydiver's kinetic energy can remain positive as long as he is in motion.
4. "His kinetic energy would remain the same for the whole fall as long as he lost no mass."
This statement is not entirely accurate. While it is true that kinetic energy would remain constant if the skydiver lost no mass, the scenario mentions a change in speed from initial acceleration to a consistent speed. So, the skydiver's kinetic energy does change during the fall due to the changing velocity.
Based on the explanations above, the correct answer is: "His kinetic energy increases while his speed increases, then it became constant."