If a 4 kg object is moving at 3 m/s and another 2 kg object is moving at 6 m/s, which one has more kinetic energy?
The 2 kg object moving at 6 m/s
Kinetic energy is given by KE = ½ × m × v2. For the 4 kg object moving at 3 m/s, KE = ½ × 4 × 32 = ½ × 4 × 9 = 18 J.
For the 2 kg object moving at 6 m/s, KE = ½ × 2 × 62 = ½ × 2 × 36 = 36 J. Since 36 J > 18 J, the 2 kg object has the greater kinetic energy, because doubling the speed increases KE fourfold while halving the mass only halves it.
Hence, the answer is The 2 kg object moving at 6 m/s.
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