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December 22, 2014

December 22, 2014

Posted by **Lindsay** on Sunday, January 13, 2008 at 12:56pm.

I'm pretty sure that I need to solve for time using d = 1/2at^2, but the "one second after" part of this problem throws me off.

- Physics -
**Damon**, Sunday, January 13, 2008 at 2:35pm125 km/hr *1 hr/3600 s * 1000m/km =

34.7 m/s

the car travels t+1 seconds

so the car goes

d =34.7 * (t+1) = 34.7 t + 34.7 meters

the trooper travels the same distance in t seconds

d = 0 + 0t + (1/2)(2.7)t^2

so

34.7 t + 34.7 = 1.35 t^2

1.35 t^2 - 34.7 t - 34.7 = 0

solve quadratic, use solution that makes sense.

- Physics -
**Lindsay**, Sunday, January 13, 2008 at 3:13pmThanks. :)

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