Question:
What is the kinetic energy of a body of mass $ 2 \, \text{kg} $ moving with a velocity of $ 5 \, \text{m/s} $?
What is the kinetic energy of a body of mass $ 2 \, \text{kg} $ moving with a velocity of $ 5 \, \text{m/s} $?
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Remember: Kinetic energy is always positive and is given by \( KE = \frac{1}{2} m v^2 \).
Updated On: Jan 22, 2026
- \( 25 \, \text{J} \)
- \( 10 \, \text{J} \)
- \( 50 \, \text{J} \)
- \( 5 \, \text{J} \)
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The Correct Option is A
Solution and Explanation
Calculate the Kinetic Energy of a Body
We are given the following data:
- Mass of the body \( m = 2 \, \text{kg} \)
- Velocity of the body \( v = 5 \, \text{m/s} \)
Step 1: Recall the formula for kinetic energy
The formula for kinetic energy is: \[ KE = \frac{1}{2} m v^2 \]
Step 2: Substitute the given values
\[ KE = \frac{1}{2} \times 2 \, \text{kg} \times (5 \, \text{m/s})^2 \]
Step 3: Simplify the calculation
\[ KE = \frac{1}{2} \times 2 \times 25 = 25 \, \text{J} \]
Conclusion:
The kinetic energy of the body is \( 25 \, \text{J} \).
The correct answer is:
Option 1: 25 J
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