question number two. please help.

Momentum = (mass) x (velocity) in the direction of the velocity.Change of momentum = "impulse" = (force) x (time)=============================================2-a).  Momentum before the hit = (0.14) x (40) = 5.6 N-m/s toward the East.Momentum after the hit = (0.14) x (46) = 6.44 N-m/s toward the West.Change in momentum = (5.6) + (6.44) = 12.04 N-m/s .(The hit soaked up all the momentum pointing east, and then provided momentum toward the west. So the total change in momentum is the sum of before- and after-.)(The east momentum changed from 5.6 to zero, and the west momentum changed from zero to 6.44.  So the total change is the sum of before-and after-.)(If you call east the positive direction, then the momentum changed from +5.6 to -6.44, and the difference between those is 12.04 .)2-b).  12.04 N-m/s = (Force) x (0.012 second)Force = 12.04 / 0.012 = 1,003 and 1/3 Newtons