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November 28, 2014

November 28, 2014

Posted by **John** on Sunday, July 8, 2012 at 6:34pm.

- Physics -
**bobpursley**, Sunday, July 8, 2012 at 6:42pmIn relative distance, you travel 2.7x2 meters. Your relative velocity is 9km/hr (change to m/s).

time to pass: relative distance/relative speed

Now, with that time; how far did you travel..

distance=your speed*time.

- Physics -
**manjeet**, Monday, July 9, 2012 at 11:18amRELATIVE DISTANCE IS 5.4 METERS

(VELOCITY=SPEED)TO FIND RELATIVE SPEED IN M/S, WE DO THAT A.T.Q.

9*1000/60*60=9000/3600=5/2 =2.5 M/S

TIME TO PASS =5.4/2.5=2.16

DISTANCE=SPEED*TIME

DISTANCE =2.5*2.16 =5.4 METERS

- Physics -
**Alex**, Sunday, July 29, 2012 at 4:03pmActually, the two people above are wrong. They did not take into account the 10m travelled behind and in front. The total distance is 25.54 m (10+2.7+10+2.7). The velocity relative to the other car is 9km/h (2.5 m/s). You must use 9 km/h and not 114 km/h because the other car is in motion too. Thus the time is 25.54/2.5, which is 10.16 s. With significant digits, the answer is 10 seconds.

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