First slide
Work
Question

A mass 10kg moving with a speed 10 cm/s on a smooth horizontal surface hits a spring as shown in figure.  Work done by the spring force on the mass is ,

Moderate
Solution

   
from work energy theorem work done = change in KE W = KEfinal-KEinitial; mass comes to rest finally , KEfinal=0 Work done by spring  =   - K.E. of mass work done=    12(10)  (0.1)2 work done by spring  =      0.05joule

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