Question:medium

A body of mass 2 kg is moving with a velocity of 10 m/s. What is its kinetic energy?

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Kinetic energy depends on the square of the velocity, so doubling the speed quadruples the kinetic energy. Always check unit consistency.
Updated On: Nov 26, 2025
  • 100 J
  • 200 J
  • 50 J
  • 400 J
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The Correct Option is A

Solution and Explanation

Step 1: State the formula for kinetic energy (\( KE \)): \( KE = \frac{1}{2} m v^2 \), with \( m \) representing mass and \( v \) representing velocity.
Step 2: Insert the provided values: Mass \( m = 2 \, \text{kg} \), Velocity \( v = 10 \, \text{m/s} \). \( KE = \frac{1}{2} \cdot 2 \cdot (10)^2 \).
Step 3: Execute the calculation: - Calculate the velocity squared: \( (10)^2 = 100 \). - Multiply by mass and divide by two: \( KE = \frac{1}{2} \cdot 2 \cdot 100 = 1 \cdot 100 = 100 \, \text{J} \).
Step 4: Confirm the result. The units align (\( \text{kg} \cdot (\text{m/s})^2 = \text{J} \)), and the calculated 100 J is the correct kinetic energy.
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