Question

A block of mass 20 kg slides along a horizontal floor with an initial velocity of
+23 ms-1
. The coefficient of friction between the floor and the block is μk = 0.65.
Sketch the forces acting on the block, indicating their magnitude.

Answer 1

$$F=N=mg=(20)(9.8)=196\ N\\F_f=0.65(196)=127\ N$$