In Fig. 6-29, a force `vecP` acts on a block weighing 45 N. The block is initially at rest on a plane inclined at angle `theta= 15^(@)` to the horizontal. The positive direction of the r axis is up the plane. Between block and plane, the coefficient of static friction is `mu_(s) = 0.50` and the coefficient of kinetic friction is `mu_(k) = 0.34`. In unitvector notation, what is the frictional force on the block from the plane when `vecP` is (a)`(-5.0 N)hati, (b) (-8.0 N)hati, and (c) (-15 N)hati`?

Explanation

`vecf_(s)=(17 N)hati, (b) vecf_(s)=(20 N) hati,(c) vecf_(k)=(15 N)hati`