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September 23rd, 2007, 09:36 AM  #1 
Newbie Joined: Aug 2007 Posts: 2 Thanks: 0  i've been stuck on these problems FOREVER. please help
I've been stuck on these problems forever and i still can't get it. 1) A boat is cruising at a constant speed of 2.2 m/s when it is shifted into neutral. After coasting 12.0 m the engine is engaged again, and the boat resumes cruising at the reduced speed of 1.6 m/s. How long did it take for the boat to coast the 12.0 m? 2) Landing with a speed of 125 m/s, and traveling due south, a jet comes to rest in 8.00 102 m. Assuming the jet slows with constant acceleration, find the magnitude and direction of its acceleration. 3) A bicyclist is finishing his repair of a flat tire when a friend rides by at 3.0 m/s. Two seconds later, the bicyclist hops on his bike and accelerates at 2.2 m/s2 until he catches his friend. any help would be really appreciated 
October 27th, 2007, 06:03 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 19,733 Thanks: 1810 
1. You'd need some extra information relating to the boat's speed when coasting. 2. What does "in 8.00 102 m" mean? 3. I understand the description, but what is the question? 
October 27th, 2007, 06:42 AM  #3  
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Quote:
For 2, it means that the jet decelerates at a constant rate from 125 m/s to 0 m/s in a distance of 8.00102 meters. For 3, I suspect the question asks for either distance traveled or time required. Assume that the "hopping" takes 0 seconds.  

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