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​Q15. A 2kg body is dropped from height of 1m onto a spring of spring constant 800 N/m as shown in the figure. A frictional force equivalent to 0.4 kg-wt acts on the body. The speed of the body just before striking the spring will be :

   1) 1 m/s

   2) 2 m/s 

   3) 3 m/s

   4) 4 m/s

     
 

Dear Student ,
Here is a link which will help you to solve this question with proper explanation .
https://www.meritnation.com/ask-answer/question/a-2-kg-body-is-dropped-from-a-height-of-1-m-onto-a-spring/work-energy-and-power/9688127

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