A block of mass m moving with a velocity v_(0) on a smooth horizontal surface strikes and compresses a spring ofstiffuess k till mass coines 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 To an observer A, the net work done on the block is:

A block of mass m moving with a velocity v_(0) on a smooth horizontal

1.	A block of mass m moving with a velocity v_(0) on a smooth horizontal surface strikes and compresses a spring ofstiffuess k till mass coines 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 To an observer A, the net work done on the block is:
Answer» `- mv_(0)^(2)` `+ mv_(0)^(2)` `- (1)/(2) mv_(0)^(2)` zero Answer :C