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July 28, 2015

Homework Help: Physics

Posted by Ana on Saturday, February 6, 2010 at 11:12am.

A train is traveling down a straight track at 22 m/s when the engineer applies the brakes, resulting in an acceleration of -1.0 m/s2 as long as the train is in motion. How far does the train move during a 40 s time interval starting at the instant the brakes are applied?

Distance = velocity(initial) * time + 1/2 * acceleration * time^2

D = 22 * 40 + 1/2 * (-1) * 1600

D = 880 + (-800)

D = 80
What's wrong with my approach?
Thanks.

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