The sum of potential energy and kinetic energy is known as:

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RRB ALP CBT I 29 Aug 2018 Shift 2 Official Paper
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  1. Electrical energy
  2. Mechanical energy
  3. Chemical energy
  4. Light energy

Answer (Detailed Solution Below)

Option 2 : Mechanical energy
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The correct answer is Mechanical energy

Key Points

  • Kinetic Energy (KE) is the energy possessed by a body due to its motion.
    • It is given by the formula \(KE = 1/2 mv^2\)  where 'm' is the mass of the body, and 'v' is the velocity of the body at any given time.
  • Examples of Kinetic energy include: 
    • ​A fast-moving cricket ball hits the stationary wicket and the wicket uproots from its position.
  • Potential Energy (PE) is the energy possessed by a body due to its change in position or shape.
  • The sum of Potential energy and Kinetic energy is known as Mechanical energy. Hence option 2 is correct.
  • Examples of Potential energy include:
    • A stone lying on the roof of a building has potential energy due to its height.

Additional Information

  • Electrical energy is the energy required to maintain the flow of charged particles in opposition to the resistance in an electric conductor or an appliance.
  • Chemical energy is the energy that is absorbed or released during a chemical reaction.
  • Light energy is Electromagnetic radiation with wavelengths between 380 and 750 nm which is visible to the human eye.
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