Physics-
General
Easy
Question
A block of mass m moving with a velocity 
on a smooth horizontal surface strikes and compresses a spring of stiffness k till mass comes to rest as shown in the figure. This phenomenon is observed by two observers According to the observer A
A) Standing on the horizontal surface
B) Standing on the block
- the kinetic energy of the block is converted into the potential energy of the spring
- the mechanical energy of the spring–mass system is conserved
- the block loses its kinetic energy because of the negative work done by the conservative force of spring
- all the above
The correct answer is: all the above
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