Question

A body of mass 2 kg is moving with a velocity of 3 m/s. What is its kinetic energy?

• A. 6 J
• B. 9 J
• C. 12 J
• D. 18 J

Hint:

Remember: The kinetic energy of an object depends on its mass and velocity. It is directly proportional to the square of the velocity.

Answer 1

The Correct Option is B

Step 1: Use the formula for kinetic energy The formula for the kinetic energy (\( KE \)) of a body is: \[ KE = \frac{1}{2} m v^2 \] where: - \( m \) is the mass of the body, - \( v \) is the velocity of the body. Step 2: Substitute the given values Given: - Mass \( m = 2 \, \text{kg} \), - Velocity \( v = 3 \, \text{m/s} \). Substitute these values into the formula: \[ KE = \frac{1}{2} \times 2 \times (3)^2 = 1 \times 9 = 9 \, \text{J} \] Answer: Therefore, the kinetic energy of the body is 9 J. So, the correct answer is option (2).