Question

1. In which of the following situations is potential and kinetic energy both increasing?
a.Raindrop is falling from the sky
b. A marble is at rest on a frictionless floor
c. a rocket is accelerated upward after a launch
d. none of the preceding
2. Which of the following statements is true?
a. Energy cannot be created from nothing nor destroyed, rather it is only transformed from one form to another
b. The total ME of an object is increasing whether it is moving with a constant acceleration
c. Conservation of ME only applies to objects that have vertical motion and not on objects moving along horizontal
d. The total energy of two colliding bodies is not conserved after collision because some energy become sound​

Answer 1

Answer:

1. c) a rocket is accelerated upward after a launch.

2. d) the total energy of two colliding bodies is not conserved after collison because some energy become sound.

Thanks, have a great day ahead !  ; )

Answer 2

Answer:

1. c. a rocket is accelerated upward after a launch, 2. d. The total energy of two colliding bodies is not conserved after collision because some energy become sound​ is true.

Explanation:

Potential and kinetic energy both increases :

• At the same time, objects can have both kinetic and potential energy.
• At the same time, an item can be moving (kinetic energy) and lifted above the ground (and also have potential energy).

Energy of colliding bodies:

• Kinetic energy is lost from a system of colliding objects because the collision transforms kinetic energy into other forms of energy - sound, heat and light energy.
• In an inelastic collision, the system's momentum is preserved, but the kinetic energy is not.
• This is due to the transfer of some kinetic energy to something else.