10、 In Figure 10, a horizontal force of 500 N acts on a block of weight 1.5 kN placed on an
inclined plane. The coefficients of friction between the block and the plane are
0.25 μs
=
and
0.20 μk =
. What is the actual frictional force? (A) 200N (B) 500 N (C) 300 N (D) 450 N。