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document.write( "Find the time it takes to travel 30km for a bus which accelerates uniformly
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document.write( "from 40km/hr to 80km/hr. Show your solution.
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document.write( "You are given: initial velocity 
= 40 km/h;\r\n" );
document.write( " ending velocity 
= 80 km/h;\r\n" );
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document.write( " travel distance d = 30 km.\r\n" );
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document.write( "To find the time, start from these two kinematic equations\r\n" );
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document.write( " d = 
+ 
, (1)\r\n" );
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document.write( " a = 
, (2)\r\n" );
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document.write( "where \" a \" is the acceleration. Substitute (2) into (1), eliminating \"a\". You will get\r\n" );
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document.write( " d = 
= 
= 
= 
= 
.\r\n" );
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document.write( "Thus you started from the formal kinematic formula (1) and ended with intuitively understandable formula\r\n" );
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document.write( " d = .\r\n" );
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document.write( "Now you only need substitute the given data to get simple equation\r\n" );
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document.write( " 30 = 
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document.write( " 30 = 60t\r\n" );
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document.write( " t = 
= 
of an hour = 30 minutes. ANSWER\r\n" );
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document.write( "Solved.\r
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document.write( "![\"\"](\"/images/stars/stars-13.gif\")
