A I 930-kg railroad flatcar, which can move on the tracks with virtually no friction, is sitting motionless next to a station platform. A 108-kg football player is running along the platform parallel to the tracks at 9.74 m/s. He jumps onto the back of the flatcar. (a) What is the speed of the flatcar after he is aboard and at rest

on the flatcar? (b) Now he starts to walk, at 0.520 m/s relative to the flatcar, to the front of the car. What is the speed of the flatcar as he walks?

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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