Physics-
General
Easy

Question

A block of mass m moving with a velocity v0 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:
A: standing on the horizontal surface
B: standing on the block

According to the observer A

  1. the kinetic energy of the block is converted into the potential energy of the spring    
  2. the mechanical energy of the spring-mass system is conserved    
  3. the block loses its kinetic energy because of the negative work done by the conservative force of spring    
  4. all the above    

The correct answer is: all the above

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