A motor winds the rope in B with a constant acceleration aB. Because of the pulley
system, the mass m in A slides in this way to the left over a horizontal axis.
Between m and the left end point of the horizontal axis, there is a spring (constant
k, unstretched length l0). The coefficient of kinetic friction between m and the axis
is μK. When sA equals 1.5 m, vB equals 6 m/s. For this situation, determine at that
instant the velocity of A and the acceleration of A.
Data: aB = 2 m/s2, m = 2 kg, k = 150 N/m, l0 = 2 m, μK = 0.3