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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > Two blocks of masses M and 3M are placed on a horizontal, frictionless surface. A light spring is attached to one of them and the blocks are pushed together with the spring between them. A cord initially holding the blocks together is burned, after that, the block of mass 3M moves to the right with a speed of 2.00m/s. (a) What is the velocity of the block of mass M. (b) Find the system’s original elastic potential energy, taking M=0.350kg. (c) Is the original energy in the spring or in the cord? Explain your answer. (d) Is momentum of the system conserved in the bursting apart process? How can it be with large forces acting? How can it be with no motion beforehand and plenty of motion afterward?

Two blocks of masses M and 3M are placed on a horizontal, frictionless surface. A light spring is attached to one of them and the blocks are pushed together with the spring between them. A cord initially holding the blocks together is burned, after that, the block of mass 3M moves to the right with a speed of 2.00m/s. (a) What is the velocity of the block of mass M. (b) Find the system’s original elastic potential energy, taking M=0.350kg. (c) Is the original energy in the spring or in the cord? Explain your answer. (d) Is momentum of the system conserved in the bursting apart process? How can it be with large forces acting? How can it be with no motion beforehand and plenty of motion afterward?

after that frictionless surface. A light spring is attached to one of them and the blocks are pushed together with the spring between them. A cord initially holding the blocks together is burned In figure a man stands on a boat floating in still water. The mass of the man and the boat is 60 kg and 120 kg respectively. a. If the man walks to the front of the boat and stops. what is the separation between the boat and the pier now? b. If the man moves at a constant speed of 3m/s relative to the boat the block of mass 3M moves to the right with a speed of 2.00m/s. (a) What is the velocity of the block of mass M. (b) Find the system's original elastic potential energy Two blocks of masses M and 3M are placed on a horizontal what is the total kinetic energy of the system (boat + man)? Compare this energy with the kinetic energy of the system if the boat was tied to the pier.