A particle travels 1 108 centimeters per second in a straight line for 4 10–6seconds. How many centimeters has it traveled?
F. 2.5 102
G. 2.5 1013
H. 4 102
J. 4 10–14
K. 4 10–48
謎底:H
【剖析】The correct answer is H.
Using D = rt, D = = 4 108 – 6 = 4 102 cm
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