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General
Easy
Question
For the two blocks initially at rest under constant ext. forces of mass1 kg and 2kg shown, 
Which of the following is correct?
- Force of friction on 1 due to 2 is 1 N to right.
- Force of friction on 2 due to 1 is 1 N to right.
- Force of friction on 2 due to ground is 4 N to right.
- Force of friction on 2 due to ground is 6 N to right.
The correct answer is: Force of friction on 2 due to ground is 6 N to right.
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