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Deceleration (Posted on 2003-10-02) Difficulty: 3 of 5
George is driving 100 ft/sec toward an intersection.
He looks to his right, and sees Bill, driving 30 ft/sec toward the same intersection. George foolishly slams on his brakes.

If he had kept going 100 ft/sec, he would have been through the intersection long before Bill got there.

At the instant that he slams on his brakes, the center of George's car is 125 ft from the intersection, and the center of Bill's car is 150 ft from the intersection. George's brakes give his car an acceleration of -30 ft/sec².
Bill never changes his speed.
Each car is 13 ft long and 7 ft wide.

Will there be a collision?

See The Solution Submitted by DJ    
Rating: 4.2308 (13 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
Shorter solutionRobin Routledge2003-10-09 17:12:05
Solutionre: fiziks...here goesfwaff2003-10-03 04:22:47
fiziks...here goesVito2003-10-02 20:32:53
Just to be complete...nikki2003-10-02 16:15:00
oops, made myself look dumber than I really amFatBoy2003-10-02 14:26:06
re: Hey guys!!Charlie2003-10-02 14:25:02
re(2): Hey guys!!FatBoy2003-10-02 14:12:45
re: Hey guys!!SilverKnight2003-10-02 13:56:27
QuestionHey guys!!FatBoy2003-10-02 13:12:35
Hints/Tipsre: SolutionSilverKnight2003-10-02 13:00:45
re: Solutionfwaff2003-10-02 12:59:23
SolutionSolutionDavid2003-10-02 11:27:37
re: okay, here goesCharlie2003-10-02 09:43:34
re: solutionFatBoy2003-10-02 09:27:31
Solutionokay, here goesFatBoy2003-10-02 09:25:22
SolutionsolutionCharlie2003-10-02 09:23:29
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