A ball of mass 50 grams is moving with a velocity of 15 m/s. What is its kinetic energy?

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RRB JE CE 22 Apr 2025 Shift 1 CBT 2 Official Paper
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  1. 3.750 J
  2. 1.875 J
  3. 5.625 J
  4. 7.500 J

Answer (Detailed Solution Below)

Option 3 : 5.625 J
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The correct answer is 5.625 J.

Key Points

  • The formula for calculating kinetic energy is KE = (1/2)mv², where m is the mass and v is the velocity.
  • Given, the mass (m) of the ball is 50 grams, which is equivalent to 0.05 kilograms (since 1 kg = 1000 grams).
  • The velocity (v) of the ball is given as 15 m/s.
  • Using the formula: KE = (1/2) * 0.05 kg * (15 m/s)².
  • This simplifies to: KE = (1/2) * 0.05 * 225.
  • Further simplifying: KE = 0.025 * 225 = 5.625 Joules.
  • Therefore, the correct answer is 5.625 J.

 Additional Information

  • Kinetic Energy
    • Kinetic energy is the energy possessed by an object due to its motion.
    • The unit of measurement for kinetic energy is the joule (J) in the International System of Units (SI).
    • It is a scalar quantity, meaning it has magnitude but no direction.
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