Plymouth & District Advanced Motorists
Affiliated to the Institute of Advanced Motorists (Group 1134)
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Relative Speed Calculator...

red and blue cars          

Consider two cars travelling side by side on a straight level surface. One is going faster than the other. They both do an emergency stop when they are exactly side by side. This calculator will work out the speed at which the faster car is travelling when it reaches the point at which the slower one stopped and the distance it will travel before it too has stopped.

Enter the speed of the faster car in the top box, the speed of the slower in the middle box, then click on Calculate. The results will be shown in the bottom boxes.

Enter the speed of the faster car      mph

Enter the speed of the slower car    mph

  

When it reaches the point at which the slower car has stopped, the faster car will be travelling at approximately mph and will take another feet (approx) to stop.

© 2002 Andy Sharp, Newbury Group Advanced Motorists - www.niam.org.uk

Feel free to use this calculator on your site, but please include the copyright notice above.