Hi , I was explained several times this problem , I do understand , but I dont understan the math part for example :m1 = 0.08 kgm2 = 0.05 kgu1 = 0.5 m/su2 is the initial velocity of marble B = 0 m/sv1 = velocity of marble A after collision -0.1 m/sThe formula for v2:V2= m1u1 + m2u2 -m1v1 / m2 (0.08 x 0.5) + (0.05 x 0) + (0.08 x – 0.1) / 0.05 V2=( 0.04) +( 0) + (-0.008) 0.05V2= 0.04 – 0.008 0.05V2= 0.048 = 0.96 m/s 0.05The part I dont undertand is :(0.08 x 0.5) + (0.05 x 0) + (0.08 x – 0.1) / 0.050.04 + 0 + (-0.008)why is that( 0.08 x -0.1 ) equals -0.008 if it shpuld be in my calculations - 0.02