Saturday, 29 September 2007

Problem: Kinematics #4

A train covers half the distance of its journey with a speed 20 m s-1 and the other half with a speed of 40 m s-1. The average speed of the train during the whole journey is
A. 25 m s-1
B. 27 m s-1
C. 30 m s-1
D. 32 m s-1
E. 35 m s-1


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Question source: Malaysia National Physics Competition 2007 (Secondary Level)

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