5. An object that has kinetic energy must have ____________________.
A) momentum.
B) acceleration.
C) a force applied to it.
D) All of these.
E) None of these.
The correct answer is D) All of these.
An object that has kinetic energy must have momentum, acceleration, and a force applied to it. Here's why:
1. Momentum: Momentum is the product of an object's mass and velocity. When an object is in motion (i.e., has kinetic energy), it has both mass and velocity, and therefore it has momentum. The formula for momentum is p = m * v, where p is momentum, m is mass, and v is velocity.
2. Acceleration: Acceleration is the rate at which an object's velocity changes. When a force is applied to an object, it causes the object to accelerate. So, if an object has kinetic energy, it means that it is in motion and therefore has a velocity. If the object's velocity is changing, it means that it is accelerating.
3. Force: The kinetic energy of an object is directly related to the amount of work done on it by a force. According to the work-energy principle, the work done on an object is equal to the change in its kinetic energy. So, if an object has kinetic energy, it means that work has been done on it by a force. In other words, a force has been applied to the object to put it in motion or maintain its motion.
Therefore, an object that has kinetic energy must have momentum, acceleration, and a force applied to it.