Posted by **ShaD** on Friday, February 19, 2010 at 12:21am.

the escalator that leads down into a subway station has a length of 30.0m and a speed of 1.8 m/s relative to the ground. student is coming out of subway by running up the wrong direction on escalator. local record time for this is 11s. relative to escalator, what speed must the student exceed in order to beat the record?

- Physics 2 -
**bobpursley**, Friday, February 19, 2010 at 12:23am
(speed-1.8)time=distance

solve for speed.

- Physics 2 -
**ShaD**, Friday, February 19, 2010 at 12:30am
is this correct?:

speed(time)=distance

speed=dist/time

- Physics 2 -
**bobpursley**, Friday, February 19, 2010 at 12:32am
Of course not. I gave you the answer above.

speed-1.8 = distance/time

- Physics 2 -
**ShaD**, Friday, February 19, 2010 at 12:34am
that not the answer i have in my book. the answer i have is 4.5m/s.

- Physics 2 -
**bobpursley**, Friday, February 19, 2010 at 12:40am
You need to get a basic math tutor immediately, or drop physics. The language of physics is math, and you are operating at an algebra I level, at best. You will not succeed.

speed-1.8=30/11

speed= 30/11 + 1.8= 4.5m/s

Physics comprehension will demand much higher levels of math skills than this.

Good luck.

- Physics 2 -
**DylS**, Saturday, November 19, 2011 at 8:11pm
Hi , I know how you did all the mathematically calculations but I was just wondering how u came up with the eqauation that you did.

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