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The difference is honestly closer to two orders of magnitude.

E = 1/2mv^2

1/2 * 1000kg * 50 km/h * 50 km/h * 0.2778 mh/skm * 0.2778 mh/skm = 96 kJ

1/2 * 100kg * 25 km/h * 25 km/h * 0.2778 mh/skm * 0.2778 mh/skm = 2 kJ

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