Given, mass of the block, m=31 kg worror fu KX Spring constant , k= 392 Nyou > mg x=1.40 Foot spring compression, d=6.9 cm kat K (at). = 0.069 m coefficient of kinetic frietion, M=0.45 According to the consetration of energy Imot- ung (x+2) = 1 k de + 2ug atd). + 280-459.81(1-4+0.069] ms TT vt kd = IN 392 X 0.0692 3.1 / IT v= 3.684 m/s = 3.68 m/s block's velocity