A gun kept on a straight horizontal road is used to hit a car traveling along the same road away fron the gun with a uniform speed of 72*21/2 km/h. The car is at a distance of 50m from the gun, when the gun is fired at an angle of 45o with the horizontal. Finda) the distance from the gun from the car when the shell hits it.b)the speed of projection of shell from the gun .[g=10m/s2]

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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