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 observer B, the potential energy of the spring increases
A) Standing on the horizontal surface
B) Standing on the block
- due to the positive work done by pseudo force
- due to the negative work done by pseudo force
- due to the decrease in the kinetic energy of the block
- all the above
The correct answer is: due to the negative work done by pseudo force
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