A 3kg block starts at the top of a 30 degree incline and slides 2m down the incline in 1.5 seconds. a) Find acceleration of the block. b) Find the coefficient of kinetic friction between the blcok and the incline. For a) x = vot + 1/2at^2 --> a = 1.778m/s^2 For b) *here's where i'm having some problems* I tried doing it two different ways and i get two different answers. Way 1: Ff = uFn Ff/Fn = u mgsinx/mgcosx=u tanx=u u = .577 Way 2: ΣF=ma mgsinx - umgcosx = ma gsinx - ugcosx =a a-gsinx/-gcosx = u (1.778m/s^2 - 5m/s^2)/-(10*cos30) = u u = .372 which way is wrong?