As shown in the figure below, a light string that does not stretch changes from

Question

As shown in the figure below, a light string that does not stretch changes from horizontal to vertical as it passes over the edge of a table. The string connects m1, a 3.60 kg block, originally at rest on the horizontal table at a height 1.29 m above the floor, to m2, a hanging 3 kg block originally a distance d = 0.980 m above the floor. Neither the surface of the table nor its edge exerts a force of kinetic friction. The blocks start to move from rest. The sliding block m1 is projected horizontally after reaching the edge of the table. The hanging block m2 stops without bouncing when it strikes the floor. Consider the two blocks plus the Earth as the system.

Is the energy of the system when it is released from rest equal to the energy of the system just before m1 strikes the ground? Why or why not?

Explanation / Answer

Here , NO the energy of system when released from rest is not equal to the energy of the system when m1 strikes the ground as before m1 , m2 strikes the ground adn loses it's kinetic energy in collision with the ground .Due to this loss in kinetic energy , system lost energy and energy of the system when it is released from rest is not equal to the energy of the system just before m1 strikes the ground.

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