Which Object Would Have the Least Effect on Our Planet

Which object would have the least effect on our planet if it were to strike Earth?

A) a 1-kg asteroid traveling at 30 km/s
B) a 5-kg asteroid traveling at 10 km/s
C) a 100-kg comet traveling at 10 km/s
D) a 1,000-kg small car traveling at 100 miles/h, which is 0.05 km/s
E) a 3,000-kg truck traveling at 35 miles/h, which is 0.02 km/s

Correct Answer:

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