three blocks m1,m2 and m3 of masses 8kg,3kg and1 kg are placed in contact on a smooth surface.Forces F1=140N and F2=20N are acting on blocks m1 and m3 respectivly.The reaction between blocks m2 and m3 is

1)2.5N

2)7.5N

3)22.5N

4)30N

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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