If the coefficient of friction is 0.4. the force parallel to the black board required to slide the eraser upwards with uniform velocity is



 

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Explanation:
We have given,
An eraser weighing 2N is pressed against the black board with an 5N. The coefficient of friction is 0.4.
So,

Thus,
Force = 2N + 2N = 4N
Physics class 11
Final Answer:

Hence, Option C is correct i.e, 4N

 

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