Two trucks of mass M
each are moving in opposite direction on adjacent parallel tracks with same velocity u
. One is carrying potatoes and other is carrying onions, a bag of potatoes has a mass m1
and bag of onions has mass m2
(included in the mass of truck M
). When trucks get close to each other while passing, the drivers exchange a bag with the other one by throwing the other one. Find the final velocities of the trucks after exchange of the bags.