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 To an observer A, the work done by spring force is
A: Standing on the horizontal surface
B: Standing on the block
- negative but nothing can be said about its magnitude
- positive but nothing can be said about its magnitude
The correct answer is:
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