If an object is placed at a height of tem above the ground at a stationary point. It posses what types of energy?

Analysis

The question asks us to identify the type of energy possessed by an object that is held at a specific height above the ground while remaining stationary.

Concept Explanation

In physics, energy is broadly categorized into two main forms:

1. Kinetic Energy: The energy an object possesses due to its motion. Since the object in the question is stationary (not moving), its kinetic energy is zero.
2. Potential Energy: The energy an object possesses due to its position or configuration. Specifically, Gravitational Potential Energy (GPE) is the energy stored in an object because of its height relative to a reference point (the ground).

The formula for gravitational potential energy is:

Where:

• m = mass of the object
• g = acceleration due to gravity
• h = height above the ground

Because the object is at a height ($h$) and has mass ($m$), it stores energy by virtue of its position.

Step-by-Step Solution

1. Evaluate the state of the object: The object is at a height ($h > 0$) and is stationary ($v = 0$).
2. Check Kinetic Energy: Since the velocity is zero, $KE = \frac{1}{2}mv^2 = 0$.
3. Check Potential Energy: Since the object is at a height above the ground, it possesses gravitational potential energy ($PE = mgh$).
4. Conclusion: An object held at a height possesses potential energy. While "Mechanical energy" is the sum of kinetic and potential energy, "Potential energy" is the specific and most accurate description of the energy stored due to its stationary position at a height.

Answer

The correct option is C.

Exam Tip

Whenever you see a question about an object at a "height," immediately think of Potential Energy. If the question mentions the object is "falling" or "moving," then you must consider Kinetic Energy or a combination of both (Mechanical Energy).