Question

Read the description of the motion of the bold-faced objectand decide if the kinetic energy (KE) and the gravitationalpotential energy (PE) is increasing, decreasing, orremaining constant.After takeoff, the toy rocket climbed to aheight of 25 meters above the ground.

Answer 1

The total energy of the rocket is,

`E=K+U`

where K is the kinetic energy and U is the potential energy,

The gravitational potential energy of the rocket is,

`U=\text{mgh}`

where m is the mass, g is the acceleration due to gravity and h is the height of the rocket,

As the height of the rocket is increased, thus, the value of the potential energy of the rocket is increased.

According to the law of conservation of energy, the net energy of the rocket remains the same at every point.

Thus, with the increase in the value of potential energy of the rocket at 25 meters height, the value of kinetic energy decreases.

Hence,