Santa's modern sleigh is powered by "magical dark matter", measured in kg. As it is used...
Santa's modern sleigh is powered by "magical dark matter", measured in kg. As it is used up, its mass vanishes. If Santa's 3000 kg (total mass) sleigh is moving at 20 m/s and uses up 300 kg, its new speed is:
a. 21.7 m/s b. 22.2 m/s c. 26.7 m/s d. 200 m/s e. none of these
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Santa's modern sleigh is powered by "magical dark matter",
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