Q. A railway flat car,whose mass together with the artillery gun is M , moves at a speed V . The gun barrel makes an angle ? with the horizontal. A shell of mass 'm' leaves the barrel at a speed v,relative to the barrel.The what is the speed of the flat car in order to stop after the firing?

Three identical balls are placed on a frictionless horizontal surface touching each other. They stick to each other because of adhesive. Another ball of same radius and mass m is placed over the void created by the three balls. Find the forces applied by the balls kept on the floor to each other if the system remains in equilibrium.

A car loaded with water having total mass 1000 kg moves on a straight horizontal Road starting from rest under the action of a force of 100 Newton. The water spills throw a small hole in the bottom at a rate of 0.1 KG per second the velocity of cart after 300 seconds is nearly.

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