n the figure below, the coefficient of kinetic friction between the block and inclined plane is 0.18 and angle θ = 55°. What is the block's acceleration (magnitude and direction) assuming the following conditions?
(a) It is sliding down the slope.
m/s2
down the slope
(b) It has been given an upward shove and is still sliding up the slope.
m/s2
down the slope