A 2 kg block rests on a horizontal surface where the coefficient of kinetic friction is 0.20. A constant horizontal force of 12 N is applied for the first 4 m, after which the force is removed. (Take g = 10 m s⁻².)
a. (i) Calculate the speed of the block just after it has moved 4 m.
b. (ii) After the force is withdrawn, how much further will the block travel before coming to rest?