A boy of mass 60kg is standing over a platform of mass40 kg placed over smooth horizontal surfaceHe throws a stone of mass of 1kg with vel 10ms at an angle of 45 with respect to groundFind the displacement of platform with boy on the horizontal surface when the stone lands on the ground (take g=10mss)

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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