Internal frame S’ moves at a speed of 0.60c with respect to frame S in the direction of increasing x. In frame S, event 1 occurs at the origin at t= 0 and event 2 occurs on the x axis at x=3.0 km and at t-4.0 ps. What times of occurrence does observer S’ record for these same events? Explain the reversal of the time order.

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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