document.write( "Question 1196037: With an average acceleration of -2 m/s2, how long will it take to a cyclist to bring a bicycle with an initial speed of 5 m/s to a complete stop? \n" ); document.write( "

Algebra.Com's Answer #828711 by ikleyn(52906) $\"\"$ $\"About$

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document.write( "(a)  If the question is \"how long time\", then write the basic equation (like definition) of the acceleration\r\n" );
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document.write( "         a = ,\r\n" );
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document.write( "     where \"a\" is the acceleration, t is the time interval,   and   are the velocities \r\n" );
document.write( "     at the beginning and the end of the time interval, respectively.\r\n" );
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document.write( "     Substitute the given values into equation (1)  a = -2 m/s^2,   = 0 m/s (full stop),   = 5 m/s\r\n" );
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document.write( "         -2 = ,  or  -2 = .\r\n" );
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document.write( "     It gives  t =  =  = 2.5 seconds.     ANSWER\r\n" );
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document.write( "(b)  If the question is \"how long distance\", then use the formula \r\n" );
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document.write( "         d =  =  =  = 6.25 m.    ANSWER\r\n" );
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document.write( "     Here 2.5 represents 2.5 s, which is the braking time found above.\r\n" );
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