Motion System Design

Repeat o' fender

Kristy Klutzmeier swore she'd never own an SUV, but her insurance agent's loaner is beginning to win her over. She's using it for the third time in as many months, and it was the agent, in fact, who called to inform Kristy that the damage from her most recent accident was repaired — just as traffic on the Q.E.W. began to back up. Like so many times before, Kristy braked too late.

If the SUV weighs 5,900 lb and was traveling 30 mph before the impact, how fast was it going just after? Assume the car in front weighs 3,200 lb and was traveling 20 mph. For extra credit, what is the Q.E.W. and where is it? The additional information you need to solve this problem can be found on our website at

Send your solution to [email protected] by June10. Last month's full solution can be found on our website as well.

Win a Fluke multimeter

The winner of this month's problem will receive a professional grade multimeter from Fluke Corp., Everett, Wash. Valued at over $200, the Model 179 is a true rms multimeter (0.09% accuracy) that comes with a lifetime warranty. For information on accessories and other models, call (888) 492-7550 or visit Fluke's website at


  • Measures temperature from -40 to 752°F (probe included)
  • Measures current from 0.01 mA to 10 A; voltage from 0.1 mV to 1,000 V
  • Measures frequency from 2 Hz to 100 kHz
  • Easy to read 6,000 count backlit display
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