a particle starts from rest with uniform acceleration a. it's velocity after ‘n’ second is ‘v’. The the displacement of the body in the last 2 seconds is

1. 2v(n-1)/n
2. v(n-1)/n
3. v(n+1)/n
4. 2v(2n+1)/n

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.

11

21

31

41