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gigglez3576
Mar 1, 2011, 03:02 PM
Find the Net force required to bring a 110 kg bike and rider traveling at a velocity of 22.7 m/s to a complete stop in 10 seconds? Assume that the bike is traveling in the positive x direction.

When I first attempted this question I got -249.7. However apparently that is wrong? Please Help

jcaron2
Mar 1, 2011, 04:05 PM
Your answer is correct. Who or what told you it was wrong?

F=ma=m\frac{\Delta v}{\Delta t}=110 kg \cdot \frac{-22.7 m/s}{10 s}=-249.7 N

gigglez3576
Mar 1, 2011, 06:20 PM
Thanks! I thought I had it right but I had an online homework assignment that told me it was incorrect.

jcaron2
Mar 1, 2011, 07:38 PM
Nothing like an erroneous answer to add confusion where there was none before. Like physics isn't confusing enough to begin with!

Luckily you know what you're doing. Good job!