A block of mass 4.0kg rests on a rough horizontal surface. Starting from rest, it is acted upon by a horizontal force of 60N that lasts for 0.40s. After the force ceases, the block continues to slide and finally stops after moving an additional 5.0m. Take g=9.8ms−2.
a. (i) Find the speed of the block immediately after the 0.40s interval.
b. (ii) Calculate the coefficient of kinetic friction between the block and the surface.