Question

A 0.5 kg object is moving with a velocity of 10 m/s. What is its kinetic energy?

• A. \( 50 \, \text{J} \)
• B. \( 100 \, \text{J} \)
• C. \( 200 \, \text{J} \)
• D. \( 25 \, \text{J} \)

Hint:

Kinetic energy depends on the square of the velocity. Even a small change in velocity can lead to a large change in kinetic energy.

Answer 1

The Correct Option is A

The kinetic energy (K.E.) of an object is given by the formula: \[ K.E. = \frac{1}{2} mv^2 \] Where: - \( m = 0.5 \, \text{kg} \) is the mass of the object, - \( v = 10 \, \text{m/s} \) is the velocity of the object. Substituting the values: \[ K.E. = \frac{1}{2} \times 0.5 \times (10)^2 = \frac{1}{2} \times 0.5 \times 100 = 50 \, \text{J} \] Thus, the kinetic energy of the object is \( 50 \, \text{J} \).