A 500-g ball moves at 4.0 m/s. What is its kinetic energy?
A1,000 J
B4.0 J
C8.0 J
D0.5 J
Explanation
📌 First convert mass: 500 g = 0.500 kg. Then KE = ½mv² = ½(0.500)(4.0)² = 0.25 × 16 = 4.0 J. Distractor A forgot to convert grams to kg (used 500 kg directly) — a critical CBE trap; C forgot the ½; D forgot to square v.