Homework Help: physics

Posted by Hayley on Monday, August 22, 2011 at 8:03pm.

how long does it take an automobile traveling at 76.9 km/h to become even with a car that is traveling in another lane at 57.9 km/h if the cars' front bumpers are initially 145 m apart?

physics - drwls, Tuesday, August 23, 2011 at 1:02am
The distance between the cars is reduced at a rate 76.9-57.9 = 19 km/h = 5.28 m/s

To close a gap of 145 m will require
145m/5.28m/s = 27.4 seconds

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