Question

A rocket is at rest on the launch pad. When the rocket is launched, its kinetic energy increases.

Answer 1

Answer:

First statement: True

Second statement: FALSE

Explanation:

As we know that the kinetic energy is the energy of a body possessed by the virtue of its motion.

As the rocket is at rest on the launchpad its kinetic energy is zero, but as it gets launched from its launchpad its kinetic energy increases.

The force of air resistance acts downward on the rocket while the thrust acts downward on the launchpad pushing the rocket upwards.

The total work some by the engine is not converted into the kinetic energy of the rocket because a lot of heat is produced during the fuel combustion of which not all the energy is utilized, some energy is used in overcoming the friction between the moving parts and other basic necessities.

Answer 2

Answer:

False.

Explanation:

The forces acting on the rocket would be the engine pushing it forward, but it would also be the force of gravity and air  friction acting in the reverse direction of the force of the engine. And so some energy in the form of heat, vibration, etc. would be lost to these forces, and the maximum amount of work would not be converted into kinetic energy.

So it's wrong with the  statement. The work done by the engine-generated power would be higher than the Kinetic energy, as some of the energy is lost to non-conservative forces (gravity, air resistance, etc.).