Physics-
General
Easy
Question
Two blocks A and B each of mass m are connected by a massless spring of natural length L and spring constant K. The blocks are initially resting on a smooth horizontal floor with the spring at its natural length as shown in figure. A third identical block C also of mass m moves on the floor with a speed v along the line joining A and B and collides with A. Then
- The kinetic energy of the A-B system at maximum compression of the spring is zero
- The kinetic energy of the A-B system at maximum compression of the spring is
- The maximum compression of the spring is
- The maximum compression of the spring is
The correct answer is: The kinetic energy of the A-B system at maximum compression of the spring is
Let the velocity acquired by A and B be V, then
Also 
Where x is the maximum compression of the spring. On solving the above equations, we get 
At maximum compression, kinetic energy of the
A – B system 
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