February 25, 2017

Homework Help: College Physics

Posted by eddy on Tuesday, February 23, 2010 at 4:41pm.

a 1200kg car coasts from rest down a driveway that is inclined 20degrees. to the horizontal and is 15m long. how fast is the car going at the end of the delivery if....
(a) friction is negligible
(book answer is 10m/s)

(b) a friction force of 3000n opposes the motion?
(book answer is 5.1 m/s)

dont know where to begin to solve these 2questions. I tried differant formulas, but nothing I tried came out to the answers in the book.

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