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:

Kinetic energy depends on the square of velocity, so small changes in speed have a large impact.

Answer 1

The Correct Option is B

Kinetic energy is given by: \[ KE = \frac{1}{2} m v^2 \] where \(m = 2 \, \text{kg}\), \(v = 3 \, \text{m/s}\).
Calculate: \[ KE = \frac{1}{2} \cdot 2 \cdot 3^2 = 1 \cdot 9 = 9 \, \text{J} \] Thus, option (2) is correct.