two bikes A and B start from a point. A moves with uniform speed 40m/s and B starts from rest with uniform acceleration 2 m/s². If B starts at t=0 and A starts from the same point at t=10s, then the time interval during the journey in which A was ahead of B is:

1. 20s
2. 8s
3. 10s
4. A is never ahead of B

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