दुनिया का सबसे ऊंचा rail bridge

India: Biggest, Highest, Largest, Smallest(भारत: सबसे बड़ा, सबसे ऊंचा, सबसे बड़ा, सबसे छोटा)

Asia's second longest rail-cum-road bridge was inaugurated recently in which state of India ?

An isolated rail car of mass M is moving along a straight, frictionless track at an initial speed v_(0) . The car is passing under a bridge when a crate filled with N bowling balls, each of mass m, is dropped from the bridge into the bed of the rail car. The crate splits open and the bowling balls bounce around inside the rail car, but none of them fall out. Is the momentum of the rail car + bowling balls system conserved in this collision ?