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Question

Determine the energy of an object with a mass of 5 kg at a height of 8 metres above the ground. Assume the value of 'g' as 9.8 m s-2.

This question was previously asked in
RRB NTPC 2024 Undergraduate CBT 1 Question Paper (29-Aug-2025) (Shift 1)
The correct answer is

392 J

The potential energy (PE) of an object is given by the formula:

\(PE = mgh\)

Where:

  • \(PE\) is the potential energy in Joules (J)
  • \(m\) is the mass of the object in kilograms (kg)
  • \(g\) is the acceleration due to gravity (approximately 9.8 m/s²)
  • \(h\) is the height of the object above the ground in meters (m)

In this problem, we are given:

  • \(m = 5\) kg
  • \(g = 9.8\) m/s²
  • \(h = 8\) m

Substituting these values into the formula, we get:

\(PE = (5 \text{ kg}) \times (9.8 \text{ m/s}^2) \times (8 \text{ m})\)

\(PE = 392 \text{ J}\)

Therefore, the energy of the object is 392 Joules.

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Important Questions from Potential Energy

  1. Which one of the following is not a conservative force ?

  2. Which of the following is an example of gravitational potential energy?

  3. What type of energy conversion takes place during the thunder of clouds?

  4. The potential difference is 40V. Find the work done to transmit a charge of 0.5C?

  5. Which of the following terms is used for stored energy that depends upon the relative position of various parts of a system?

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