A Thief in a stolen car crashes through the police check post at his top speed of 90 km/h . A motorcycle cop reacting after 2 seconds accelerates from rest at 5 m/s² , his top speed being 108 km/h the distance from the checkpost at which the thief is Caught is k × 250 metre then k = ? (Answer lies from 0 to 9 )

#please explain this question without using relative velocity concept##

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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