When a sewing machine needle moves up and down, when it hit the throat plate it breaks in to pieces which fly away in different direction, I just want to calculate the velocity with which those particles are moving away and how much magnetic field is required to catch/ attract those particles. Is there any formula which can help to calculate the both the things?

I am applying conservation of momentum techniques to calculate the velocity. Is this concept right? If not that what should I apply?

Please help me.

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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