How Do You Calculate Kinetic Friction on an Incline?

[tmoney9876]

A 3.30 kg block starts from rest at the top of a 30.0° incline and slides 2.60 m down the incline in 1.50 s.
(a) Find the acceleration of the block.
4.9 m/s2
(b) Find the coefficient of kinetic friction between the block and the incline.

(c) Find the frictional force acting on the block.
N
(d) Find the speed of the block after it has slid a distance of 2.60 m.
Im very confused on even how to approach this.

 

[kamerling]

your answer for (a) would be true if there was no friction. you're supposed to find the
acceleration from the distance and the time.

The real acceleration will be the sum of all the other forces on the block, including the frictional force.

do (c) before (b)