Posted by julie on Thursday, May 24, 2012 at 2:09am.
A 16kg sled starts up a 28 degree incline with a speed of 2.4m/s . The coefficient of kinetic friction is = 0.27.
part a)How far up the incline does the sled travel?
part b)What condition must you put on the coefficient of static friction if the sled is not to get stuck at the point determined in part (a)?

physics please respond  Elena, Thursday, May 24, 2012 at 5:39pm
KE =m•v²/2,
PE =m•g•h = m•g •s•sinα,
W(fr) = F(fr) •s = k•m•g•cosα •s
KE = PE +W(fr)
v²/2 = g •s(sinα + k•cosα),
s = v²/2•s(sinα + k•cosα), 
physics please respond  Elena, Saturday, May 26, 2012 at 4:15am
KE =m•v²/2,
PE =m•g•h = m•g •s•sinα,
W(fr) = F(fr) •s = k•m•g•cosα •s
KE = PE +W(fr)
v²/2 = g •s(sinα + k•cosα),
s = v²/2•g•(sinα + k•cosα),