Answers

2014-10-30T20:56:17+08:00
2014-10-30T23:57:51+08:00
Velocity =dist/time   distance coverd=200km time taken=2hr so velocity=200km/2hr =100km/hr =100 x1000m/2 x60 x60 sec=1000/72 m/s=13.88m/s
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