Question: What is the kinetic energy of a 3 kg object moving at a speed of 5 m/s?

Options:

1. 37.5 J
2. 15 J
3. 7.5 J
4. 25 J

Correct Answer: 37.5 J

Solution:

Kinetic energy KE = 0.5mv² = 0.5 × 3 kg × (5 m/s)² = 37.5 J.