Given mA=30 KG,mB=10 KG,mC=20 KG.Between A and B friction coefficent 0.3, between B and C friction coefficient 0.2 and between C and ground is 0.1 . The least horizontal force F to start the motion of any part of the system of three blocks as shown in the figure is(g=10 m/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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